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Chapter 7 Continued
 
M. FOCUSING KNOB ASSEMBLY, PART II
 
7M1. Description of the focusing knob assembly, Part II. The focusing knob assembly of the Type IV periscope is similar to the Types II and III periscopes except for minor part numbers; however, their purpose and function are the same. Refer to Sections 4P1, 2, and 3 for description, disassembly, and reassembly, as shown in Figure 4-39.    
Ill.
No.
Drawing
Number
Type I
Drawing
Number
Type IV
Num-
ber Re-
quired
Nomenclature
1P-1133-1Same1Knob
2P-1133-7Same1Knob shaft
3P-1133-8Same1Female coupling section
4P-1179-194P-1506-1091Knob and shaft taper pin
5P-1179-195P-1506-1081Knob shaft and female coupling section dowel pin
6P-1310-39P-1506-501Diopter ring lockscrew
7P-1408-2Same1Knob bracket
8P-1408-2ASame2Knob bracket dowel pins
9P-1408-6Same1Diopter ring
10P-1422-9P-1506-514Knob racket lockscrews
 
N. RAYFILTER HOUSING AND PLATE ASSEMBLY, PART II
 
7N1. Description. The rayfilter housing and plate assembly provides the necessary foundation when attached to the eyepiece window frame (7, Figure 4-38) of the eyepiece window assembly for the attachment of the rayfilter,

Figure 7-19. Rayfilter housing and plate assembly.
Figure 7-19. Rayfilter housing and plate assembly.

 
Ill.
No.
Drawing
Number
Num-
ber Re-
quired
Nomenclature
1 P-1412-7 1 Rayfilter drive actuating gear rack
2 P-1413-2 1 Housing knob
3 P-1413-3 2 Friction catch spring retainers
4 P-1413-4 2 Friction catch springs
5 P-1438-2 2 Plunger rod spring bushings
6 P-1438-3 2 Spring actuated plunger rods
7 P-1438-4 2 Spring actuated plunger knobs
8 P-1438-5 2 Plunger rod springs
9 P-1448-2 2 Ball bearing friction catches
10 P-1506-42 18 Rayfilter plate strap and rayfilter drive actuating gear rack lockscrews
11 P-1506-57 2 Spring actuated plunger knob lockscrews
12 P-1506-116 2 Rayfilter drive actuating gear rack dowel pins
13 P-1512-1 1 Rayfilter housing
14 P-1512-2 1 Rayfilter plate
15 P-1512-3 2 Rayfilter plate straps
16 P-1513-5 2 Anchor screw pins
 
452

eyebuffer and blinder assembly (Figure 7-20), and the variable density polaroid filter assembly (Figure 4-41). Figure 7-19 shows the rayfilter housing and plate assembly. All bubble numbers in Sections 7N1, 2, and 3 refer to Figure 7-19 unless otherwise specified.

a. Rayfilter plate. The rayfilter plate (14) is made of cast phosphor-bronze and is rectangular shaped. This plate serves as a foundation for the rayfilter housing (13). The upper part is provided with a center male hinge projection with a reamed hole to accommodate two spring actuated plunger rods (6) of the two female hinge projection sections of the rayfilter housing (13). The upper main inside section has a cast recess, while the remaining wall has a nominal thickness, with side shoulders and a narrow upper shoulder. The side shoulders are provided with recesses that carry the rayfilter plate straps (15) on each side. A rayfilter plate strap (15) is secured to the rayfilter plate (14) on each side with seven lockscrews each (10).

The lower section of the rayfilter plate (14) has a cast inside recess, while the remaining wall has a nominal thickness with side shoulders and a narrow lower shoulder. The left side of the inside recess of the lower section when viewed from the rear is provided with a rectangular boss section for the rayfilter drive actuating gear rack (1), secured with four lockscrews (10), and maintained in alignment with two dowel pins (12) This gear rack meshes with a rayfilter drive actuating gear (9, Figure 7-13) projecting externally from the rayfilter drive packing gland assembly. The rayfilter drive actuating ear (9) is synchronized to carry the rayfilter p fete (14) vertically with the eyepiece drive mechanism for the focusing movement of 1 1/2 plus and 2 minus diopters.

The exteriors of the side shoulders of the lower section are beveled at a 45 degrees angle, with a straight section having two spotted recesses of 120 degrees The spotted recesses allow the ball bearing friction catches (9) to retain the lower swinging part of the rayfilter housing (13). The lower part of the straight section corners are beveled at a 45 degrees angle to allow clearance for the milled concave corners of the inside recess of the rayfilter housing (13). A raised rectangular boss section on the exterior surface of the wall in the lower part serves as a stop when the ball bearing

  friction catches of the rayfilter housing (13) are engaged in the spotted recesses.

The main body wall is provided with a 3-inch opening for light transmission with anti-reflection threads in the inner circumference. This opening permits free access to the field of the periscope. The inside recess of the main body wall is provided with sliding vertical clearance over the flat flanges of the eyepiece window frame (7, Figure 4-38). The upper and lower shoulders of the main section serve as stops to restrict the vertical movement of the rayfilter plate (14) which has 1 inch of vertical guided travel over the eyepiece window frame upper and lower rectangular section shoulders (7, Figure 4-38).

b. Rayfilter plate straps. The rayfilter plate straps (15) are 1/8 inch longer than the rayfilter plate straps (3, Figure 4-40) of the Types II and III periscope rayfilter assembly. They are secured to the rayfilter plate (14) with seven lockscrews (10) in the same manner. Refer to Section 4Q1.

c. Rayfilter housing. The rayfilter housing (13) is made of cast phosphor bronze and is shaped rectangular. This housing serves as an apron foundation which can be removed readily during the installation and removal of the periscope. The upper part is provided with two female hinge projection sections, a sliding fit over the center male hinge projection section of the rayfilter plate (14). Both female hinge projection sections have an axis reamed hole to carry the spring actuated plunger rods (6) which are moved axially against spring tension for removal or reassembly to the center male hinge projection section of the rayfilter plate (14). Both female hinge projection sections have a threaded section located in their outer sides to carry two plunger rod spring bushings (5).

The internal part when viewed from the rear has machined recesses allowing a remaining main body wall of nominal thickness with side shoulders. The side shoulders are a sliding fit over the sides of the rayfilter plate (14). The lower part of the internal lower section of each side shoulder has a projecting section with a raised boss section, leaving a narrow lower side wall. The two projecting sections of the side shoulders provide sufficient wall area for the ball bearing friction catch assemblies. The

 
453

center of each projection is provided with a 90 degrees spotted recess and a tapped section with a smaller clearance hole. The ball bearing friction catches (9) fit into the clearance hole and spotted recess to protrude about 1/32 inch. A friction catch spring (4) fits loosely in the clearance hole, and is compressed against the ball bearing friction catches (9) by friction catch spring retainers (3). The spring retainer is screwed into the tapped hole in the side wall section of the two projecting sections and compresses the spring (4) to hold the ball bearing snugly, against the 90 degrees recesses.

When the rayfilter housing (13) is swung to the closed position, the ball bearing friction catches (9) engage in the 120 degrees spotted recesses in each shoulder step of the rayfilter plate (14). The raised boss section connecting the two side shoulder projecting sections contacts the raised rectangular boss section of the rayfilter plate (14) upon engagement of the two ball bearing friction catches (9).

The outer face of the main body wall is provided with a large flat raised boss which has a bored hole and shallow counterbored section. The bored hole is provided for light transmission and anti-reflection threads on its inner circumference. The variable density polaroid filter assembly (Figure 4-41), is centered in this shallow counterbored section and rests on the large flat raised boss. Either of the two assemblies is retained by two inserted anchor screw pins (16) located with an appropriate center distance concentric with the bored hole and counterbored shallow section.

In the lower central part of the outer face of the main body wall there is a raised boss with a reamed hole. The inside face of the reamed hole of the boss, when viewed from the rear, is countersunk to allow sufficient space for peening of the pressed in stub shaft section of the housing, knob (2). The housing knob furnishes the observer a provision by which he can pull the lower swinging part of the rayfilter housing (13) free of its friction catch engagement with the rayfilter plate (14).

d. Anchor screw pins. The two anchor screw pins (16) are similar to the anchor screw pins (6, Figure 4-40) of the Types II and III rayfilter assembly. Refer to Section 4Q1.

  e. Spring actuated plunger rods and plunger rod springs. The two spring actuated plunger rods (6) and the two plunger rod springs (8) are identical to the spring actuated plunger rods (23, Figure 4-40) and plunger rod springs (25) used in the Types II and III periscopes. Refer to Section 4Q1.

f. Plunger rod spring bushings. The two plunger rod spring bushings (5) are identical to the plunger rod spring bushings (22, Figure 4-40) used in the Types II and III periscopes. Refer to Section 4Q1.

g. Spring actuated plunger knobs. The two spring actuated plunger knobs (7) with their lockscrews (11) are identical to the spring actuated plunger knobs (24, Figure 4-40) used in the Types II and III periscopes. Refer to Section 4Q1.

7N2. Disassembly. The rayfilter housing and plate assembly is disassembled in the following manner:

1. Lift the lower swinging part of the rayfilter housing (13) by grasping the housing knob (2) and pulling it clear of its engagement in the friction catch spotted recesses in the rayfilter plate (14).

2. Grasp the two spring actuated plunger knobs (7), pulling them outward as far as possible, thus removing the rayfilter housing (13) from the rayfilter plate (14).

3. Remove the rayfilter plate (14) by removing the seven lockscrews (10) and the two rayfilter plate straps (15) from each side. Remove the rayfilter plate (14) and straps (15) from the eyepiece window frame (7, Figure 4-38).

4. Remove the two lockscrews (11), unscrewing them from the hubs of the spring actuated plunger knobs (7).

5. Wrap a piece of emery cloth around the extended part of each spring actuated plunger rod (6). Holding the emery cloth and plunger rod firmly with a pair of parallel pliers, unscrew each spring actuated plunger knob (7) from the threaded periphery of the spring actuated plunger rods (6) one by one.

6. Remove the spring actuated plunger rods (6) and the plunger rod springs (8) one by one

 
454

from the reamed holes in the rayfilter housing (13) two female hinge projection sections.

7. Remove the two friction catch spring retainers (3) unscrewing them from the outer two lower sides of the rayfilter housing (13), removing the two friction catch springs (4) and the two ball bearing friction catches (9).

8. Remove the four lockscrews (10) from the front lower right side of the rayfilter plate (14), unscrewing these lockscrews from the tapped holes in the rayfilter drive actuating gear rack (1). Remove the rayfilter drive actuating gear rack with its two dowel pins (12).

7N3. Reassembly. The rayfilter housing and plate assembly is reassembled in the following manner:

1. Place the rayfilter drive actuating gear rack (1) with its two dowel pins (12) on the lower left inner raised boss face of the rayfilter plate (14), when viewed from the rear. Secure the gear rack with our lockscrews (10). These lockscrews are inserted in countersunk clearance holes in the rayfilter plate front lower right side and screwed into tapped holes in the gear rack.

2. Focus the eyepiece prism to the center of the eyepiece window frame (7, Figure 4-38) making certain that the rayfilter drive actuating gear (9, Figure 7-13) is on the projecting square section of the rayfilter drive actuating shaft (8, Figure 7-13) of the rayfilter drive packing gland assembly. This central position is necessary for full focusing travel.

3. The rayfilter plate (14) is mounted only when the eyepiece lens (33, Figure 7-11) is in the center of the eyepiece window frame (7, Figure 4-38) to establish full synchronized movement. Place the rayfilter plate (14) over the flat sides of the eyepiece window frame (7, Figure 4-38). Check the rayfilter drive actuating gear rack (1) to ascertain its engagement with the rayfilter drive actuating gear (9, Figure 7-13).

4. With the rayfilter plate (14) properly centered and the gear rack in mesh with the rayfilter drive actuating gear, place both rayfilter plate straps (15) in each side shoulder recess of the rayfilter plate in the recess groove

  section of the eyepiece window frame (7, Figure 4-38). Secure the straps with seven lockscrews (10). These lockscrews are inserted in countersunk clearance holes in the rayfilter plate (14) and screwed into tapped holes in the straps.

5. Place both ball bearing friction catches (9) in clearance holes in the rayfilter housing side shoulders (13) of the lower section with both friction catch springs (4), securing them with both friction catch spring retainers (3).

6. Place the two plunger rod spring bushings (5) in the outer threaded parts of the opposite female hinge projection sections of the rayfilter housing (13). Secure them with a screwdriver.

7. Place the plunger rod springs (8) on the spring actuated plunger rods (6). Insert the spring and plunger rod in the reamed axis hole in each female hinge projection section, carrying them in from the center milled out section.

8. Place a piece of fine emery cloth around the stub section of the spring actuated plunger rod; grasp the emery cloth and stub section with a pair of parallel pliers. Compress the spring and attach the spring actuated plunger knobs (7), one by one, screwing them on the threaded part of the plunger rods (6). Secure the knobs when the shoulder section of each plunger rod is flush with the inner face of each female hinge projection section.

9. Insert the two lockscrews (11) in the hub section of each spring actuated plunger rod knob (7), securing the knobs on the two spring actuated plunger rods (6).

10. Grasp both spring actuated plunger knobs (7) and pull them outward as far as possible, and assemble the rayfilter housing female hinge projection sections (13) to the center male hinge projection section of the rayfilter plate (14). Release the outward tension of the spring actuated plunger knobs, as the springs will allow the plunger rods to snap into the reamed axis hole in opposite sides of the center male hinge projection section of the rayfilter plate. Push the lower part of the rayfilter housing down on the rectangular raised boss stop of the rayfilter plate (14); the ball bearing friction catches (9) will engage the spotted recesses of the shoulder stops in the rayfilter plate in this closed position.

 
455

 
O. RAYFILTER, EYE BUFFER, AND BLINDER, AND STOWAGE CASE ASSEMBLIES, PART II
 
7O1. Description. These assemblies are described in the following manner: The rayfilter, eye buffer, and blinder assembly is provided for attachment to the eyepiece end of the periscope. It is so designed as not to restrict the field of the periscope to the observer. The rayfilter plates are of the following colors: red, green, yellow, and polarizer. Each mounted rayfilter plate can be mounted in the base plate individually. The polaroid filter plates are carried in a separate assembly. Refer to Section 4R of the variable density polaroid filter assembly (Figure 4-41).

The rayfilter and eye buffer and blinder assembly are external to the hermetically sealed part of the periscope, as is also the rayfilter stowage case assembly. The stowage case assembly is secured to the eyepiece box bottom flange plate (13, Figure 7-12) and carries the mounted rayfilters.

Refer to Section 4S1 for the description of the eye buffer and blinder assembly. Figure 7-20 shows the rayfilter, eye buffer, blinder, and stowage case assemblies. All bubble numbers in Sections 7O1, 2, and 3, refer to Figure 7-20 unless otherwise specified.

 
Ill.
No.
Drawing
Number
Num-
ber Re-
quired
Nomenclature
1 P-1134-9 2 Rubber eyeguards
2 P-1414-3 1 Right finger grip lever
3 P-1414-4 1 Left finger grip lever
4 P-1414-5 2 Finger grip lever springs
5 P-1414-6 1 Blinder plate
6 P-1414-7 1 Blinder adjusting screw
7 P-1414-8 1 Blinder adjusting screw nut
8 P-1414-9 1 Blinder adjusting screw nut lockscrew
9 P-1416-5 2 Finger grip lever thrust stop screw pins
10 P-1416-6 2 Finger grip lever pivot screw pins
11 P-1475-13 3 Rayfilters, red, green, and yellow
12 P-1506-34 3 Rayfilter clamp ring lockscrews
13 P-1506-62 3 Stowage case body and base plate lockscrews
14 P-1511-5 1 Stowage case body
15 P-1511-6 1 Stowage case cap
16 P-1511-6A 1 Stowage case cap rivet
17 P-1511-7 1 Stowage case lower felt washer
18 P-1511-9 2 Felt separation washers
19 P-1511-10 1 Stowage case base plate
20 P-1513-2 1 Base plate
21 P-1513-3 3 Rayfilter mounts
22 P-1513-4 3 Rayfilter clamp rings
Figure 7-20. Rayfilter, eye buffer, blinder, and stowage case assemblies.
Figure 7-20. Rayfilter, eye buffer, blinder, and stowage case assemblies.
 
456

a. Rubber eyeguards. The two rubber eyeguards (1) are identical to the two rubber eyeguards (1, Figure 4-42) described under Section 4S1.

b. Base plate. The base plate (20) is almost identical to the base plate (2, Figure 4-42) described under Section 4S1. It differs in the center axis bored hole, and has no cylindrical raised boss on the lower face. The lower part of the base plate is counterbored and threaded with a coarse thread to carry the threaded periphery of the rayfilter mounts (21) against its counterbored seat. This counterbored threaded section carries any of the three assembled rayfilter mounts desired by the observer.

c. Finger grip levers. The right and left finger grip levers (2 and 3) are identical to the right and left finger grip levers (1 and 2, Figure 4-41) described under Section 4R1 They serve the same purpose and function along with the following parts: two finger grip lever springs (4), two finger grip lever pivot screw pins (10), and two finger grip lever thrust stop screw ins (9).

d. Blinder plate. The blinder plate (5) is identical to the blinder plate (6, Figure 4-42), described under Section 4S1.

e. Blinder adjusting screw. The blinder adjusting screw (6) is identical to the blinder adjusting screw (7, Figure 4-42) described under Section 4S1.

f. Blinder adjusting screw. The blinder adjusting screw nut (7) together with the blinder adjusting screw nut lockscrew (8) is identical, to the blinder adjusting screw nut (8, Figure 4-42), and lockscrew (7) described under Section 4S1.

g. Rayfilters. The three rayfilters (11) consist simply of cylindrical colored filter glass with parallel surfaces. Three shades are used; red, green, and yellow, which are provided for various conditions of observation. Each rayfilter is mounted in an individual rayfilter mount (21) and secured with a clamp ring (22) which is secured with a lockscrew (12).

h. Rayfilter mounts. The rayfilter mounts (21) are provided for each of the three shades of rayfilters. The rayfilter (11) is carried in the

  counterbored section against its counterbored seat. The outer part of the counterbored section is threaded to receive the threaded periphery of the clamp ring (22) which secures the rayfilter snugly and is secured with a lockscrew (12).

The external surface of the mount consists of an undercut shoulder with a threaded periphery to engage into the internal threaded section in the base plate (20) with a 3/4 turn. The shoulder section contacts the base plate when in position and has ample clearance in the bored hole of the rayfilter housing (13, Figure 7-19).

The outer beveled surface of the shoulder section has a straight knurl to provide a rough surface, and offers a firm grip for the removal or replacement of any shade of the three mounted rayfilters (11).

i. Rayfilter clamp rings. The three rayfilter clamp rings (22) are cylindrical, and of nominal width. The clamp ring is bored for light transmission and has a nominal remaining wall thickness. The periphery is threaded to engage into the internal threaded section in each rayfilter -mount, and is secured with a lockscrew (12) after clamping the rayfilter (11) sufficiently to prevent it from unscrewing from the mount. Each mounted rayfilter (11) is carried in the rayfilter stowage case assembly (31, Figure 7-12) attached to the eyepiece box bottom flange plate (13, Figure 7-12). The outer face of each clamp ring is provided with opposite slots for the insertion of a special wrench.

j. Stowage case base plate. The stowage case base plate (19) is made of 1/8-inch brass and is 3 1/32 inches in length. The main section is 1 15/16 inch in diameter and forms a concave junction on opposite sides with an arm 7/8 inch in diameter. The arm has a clearance hole in its center axis for attachment to the eyepiece box bottom flange plate (13, Figure 7-12) upon which it rests.

The main section carries the stowage case body (14) secured with three lockscrew (13) which are inserted in clearance holes in the stowage case body (14) and screwed into tapped holes in the stowage case base plate (19).

k. Stowage case body. The stowage case body (14) is made of sheet brass of nominal thickness and is shaped cylindrical. The

 
457

periphery coincides with the periphery of the stowage case base plate main section (19) and is secured to it with three lockscrew (13). Two opposite slots of large area having a depth of 13/16 inch are provided for rapid removal of any of the extra mounted rayfilters (11). The corners of the opposite slots are rounded. Each remaining wall directly opposite has a circumferential slot to receive the projecting rivet (16) attached in the stowage case cap (15) for its securement.

The inner face of the stowage case body wall has a felt washer (17) glued to it. The felt washer has three clearance holes for the lockscrew heads (13) which are inserted into three clearance holes in the lower wall of the stowage case body and screwed into tapped holes in the stowage case base plate (19) for the securement of the stowage case body.

1. Stowage case cap. The stowage case cap (15) is made of sheet brass of nominal thickness. The cap is a sliding fit over the stowage case body wall (14). A rivet (16) is secured at an appropriate location in the outer wall of the cap so that its inward projecting part engages in the circumferential slot in the stowage case body wall. The cap when assembled covers the large opposite slotted sections of the stowage case body and the mounted rayfilters (11) to prevent breakage and foreign matter from entering. The assembly, provides an adequate stowage case to prevent the mounted rayfilters from becoming lost.

m. Felt separation washers. The two felt separation washers (18) are made of 1/32-inch felt, having a diameter of 1 3/4 inch. One felt washer is centered and glued in the inner face of the upper wall of the stowage case cap (15), while the other is used to separate the mounted rayfilters in the stowage case body (14). On the outer face of the cap are the engraved letters rayfilters filled with, white monofil to be clearly visible to the observer.

7O2. Disassembly of the rayfilter, eye buffer, and blinder assembly: The rayfilter, eye buffer, and blinder assembly is disassembled in the following manner:

1. Unscrew the mounted rayfilter (11) from the inner face of the base plate (20) (should

  any one of the three shades of mounted rayfilters be assembled in the base plate).

2. By pulling outward with two fingers (one on each hand) placed inside near the base of the eyeguard, remove both eyeguards (1), one from the blinder plate (5) and the other from the base plate (20).

3. Using a small screwdriver, remove the two finger grip lever thrust stop screw pins (9) and the two finger grip lever pivot screw pins (10). Unscrew these four screw pins from the lower slotted walls of the base plate (20). Remove the right and left finger grip levers (2 and 3) and their two tension springs (4).

4. Remove the blinder screw nut lockscrew (8), unscrewing it from the tapped hole in the center axis in the blinder adjusting screw (6) and the counterbored recess in the blinder adjusting screw nut (7).

5. Remove the blinder adjusting screw nut (7), unscrewing it from the threaded stub section of the blinder adjusting screw (6).

6. Remove the blinder plate (5) with blinder adjusting screw (6). Remove the blinder adjusting screw (6).from the blinder plate (5).

7O3. Reassembly of the rayfilter, eye buffer, and blander assembly. The rayfilter, eye buffer, and blinder assembly is reassembled in the following manner:

1. Place the blinder adjusting screw (6) in the offset counterbored clearance hole in the blinder plate (5). Line up the flat shoulders of the adjusting screw with the flat shoulders of the blinder plate small projection by turning the adjusting screw.

2. Press the left thumb against the blinder adjusting screw thread (6), and place the raised projection pant of the blinder plate (5) in the wide shallow keyway in the base plate projection boss (20) and the protruding part of the adjusting screw into its elongated axial hole. Check to ascertain that the offset hole in the blinder plate is located outward.

3. Screw the blinder adjusting screw nut (7) on the threaded stub section of the blinder adjusting screw (6), turning it clockwise until tight. The counterbored section side should face inward.

 
458

4. Insert the blinder adjusting screw nut lockscrew (8) in the threaded axis in the blinder adjusting screw (6). The head of the lockscrew will contact the lower face of the blinder adjusting screw while the lockscrew head enters the blinder adjusting screw nut counterbored section (7). Sufficient distance of this counterbored section remains to allow the nut to be released 1/4 turn for the interpupillary adjustment of the blinder plate (5).

5. Insert the right and left finger grip levers (2 and 3) with their two tension springs (4) in the upper and lower slotted sections in the base plate (20). Compress the tension springs (4) sufficiently to line up the outer pivot hole in each finger grip lever with the pivot hole in the base plate for the insertion of the two finger grip lever pivot screw pins (10) one by one.

  Secure each screw pin in the tapped holes in the lower slotted base plate walls.

6. Grasp both finger grip levers (2 and 3) and compress them together, until near the limit of their travel. Insert the two finger grip lever thrust stop screw pins (9), and screw them into the tapped holes of the lower slotted base plate walls (20) one by one.

7. Reassemble the two eyeguards (1), one to the blinder plate (5), and the other to the base plate (20). Rotate the two lower portions of the outer flared out sections of the eyeguards so that they line up centrally.

Clean all three shades of the mounted rayfilters (11) and place them in the rayfilter stowage case assembly (31, Figure 7-12) attached to the eyepiece box bottom flange plate (13).

 
P. VARIABLE DENSITY POLAROID FILTER ASSEMBLY, PART II
 
7P1. Description. The variable density polaroid filter assembly (Figure 4-41) is identical to the variable density Polaroid filter assembly used in   the Types II and III periscopes. Refer to Section R of Chapter 4. Follow Sections 4R1, 2, and 3 for description, disassembly, and reassembly.
 
Q. TRAINING HANDLE ASSEMBLIES, PART II
 
7Q1. General description of the left and right training handles. The left and right training handles are described in the following manner:   Two handles of rugged design for training the periscope in azimuth and for operation of the prism tilt mechanism and the change of power
Figure 7-21. Left training handle assembly.
Figure 7-21. Left training handle assembly.
 
459

are secured to the eyepiece box. Each training handle interconnects with a separate training handle packing gland assembly in each side of the eyepiece box by means of a clutch. The hinges for the handles are located below the level of the center of the eyepiece. When pulled downward the handles project from the periscope horizontally. The handles are held in the extended position by a set of plunger rollers under heavy spring tension resting on the hinge cam periphery beyond the high point of the cams. As each handle is raised, the heavy tension on the rollers will return the handle to the folded position after the rollers pass the high point of the cams.

Ill.
No.
Drawing
Number
Num-
ber Re-
quired
Nomenclature
1 P-1069-15 1 Outer bevel gear clutch spring
2 P-1069-16 1 Outer bevel gear clutch retaining screw
3 P-1157-5 1 Inner bevel gear clutch
4 P-1157-6 1 Outer bevel gear clutch
5 P-1161-7 4 Hinge bracket bolts
6 P-1171-6 2 Pivot screws
7 P-1420-6 1 Detent plunger
8 P-1420-8 1 Detent plunger release knob
9 P-1421-1 1 Detent plunger spring retaining bushing
10 P-1421-2 1 Detent plunger retaining cap
11 P-1421-3 1 Detent plunger spring
12 P-1421-5 1 Detent plunger release knob lockscrew
13 P-1421-6 1 Detent plunger retaining cap lockscrew
14 P-1486-3 1 Upper leather cushion
15 P-1486-4 1 Lower leather cushion
16 P-1505-9 1 Detent plunger housing
17 P-1506-21 4 Leather cushion lockscrews
18 P-1506-30 2 Segment adjusting screw lockscrews
19 P-1506-55 1 Spring barrel lockscrew
20 P-1506-56 4 Pivot screw lockscrews, and segment adjusting screws
21 P-1506-107 2 Plunger roller
22 P-1506-115 1 Outer bevel gear clutch collar and revolving grip shaft taper pin
23 P-1509-1 1 Hinge bracket
24 P-1509-2 1 Handle hinge and fixed grip
25 P-1509-3 1 Spring barrel
26 P-1509-4 1 Revolving grip
27 P-1509-6 1 Spring barrel washer
28 P-1510-1 1 Revolving grip shaft
29 P-1510-2 1 Revolving grip shaft key
30 P-1510-3 2 Revolving grip lock nuts
31 P-1510-4 1 Index ring
32 P-1510-5 1 Revolving grip segment stop screw
 
Ill.
No.
Drawing
Number
Num-
ber Re-
quired
Nomenclature
33 P-1510-6 1 Outer bevel gear clutch collar
34 P-1510-7 1 Bearing plate
35 P-1510-8 2 Plungers
36 P-1510-9 2 Plunger rollers
37 P-1510-10 1 Coil plunger spring
38 P-1523-7 1 Index ring actuating screw

Ill.
No.
Drawing
Number
Num-
ber Re-
quired
Nomenclature
1 P-1069-15 1 Outer bevel gear clutch spring
2 P-1069-16 1 Outer bevel gear clutch retaining screw
3 P-1157-5 1 Inner bevel gear clutch
4 P-1157-6 1 Outer bevel gear clutch
5 P-1161-7 4 Hinge bracket bolts
6 P-1171-6 2 Pivot screws
7 P-1486-3 1 Upper leather cushion
8 P-1486-4 1 Lower leather cushion
9 P-1506-21 4 Leather cushion lockscrews
10 P-1506-30 2 Segment adjusting screw lockscrews
11 P-1506-54 2 Power indicating screws
12 P-1506-55 1 Spring barrel lockscrew
13 P-1506-56 4 Pivot screw lockscrews, and segment adjusting screws
14 P-1506-107 2 Plunger roller pins
15 P-1506-115 1 Outer bevel gear clutch collar and revolving grip shaft taper pin
16 P-1509-1 1 Hinge bracket
17 P-1509-2 1 Handle hinge and fixed grip
18 P-1509-3 1 Spring barrel
19 P-1509-5 1 Revolving grip
20 P-1509-6 1 Spring barrel washer
21 P-1510-1 1 Revolving grip shaft
22 P-1510-2 1 Revolving grip shaft key
23 P-1510-3 2 Revolving grip lock nuts
24 P-1510-5 1 Revolving grip segment stop screw
25 P-1510-6 1 Outer bevel gear clutch collar
26 P-1510-7 1 Bearing plate
27 P-1510-8 2 Plungers
28 P-1510-9 2 Plunger rollers
29 P-1510-10 1 Coil plunger spring
30 P-1523-6 1 Power index ring

a. Revolving grips. The two revolving grips, left and right (26 and 19, Figures 7-21 and 7-22 respectively) are made of phosphor-bronze material with the same over-all length. The outer section of each grip is rough diamond knurled on its periphery. The internal part of this outer section is counterbored with a wall

 
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Figure 7-22. Right training handle assembly.
Figure 7-22. Right training handle assembly.
hub section located a short distance from the outer end. The axis of each wall hub section has a reamed hole with a keyseat to carry the stub section of each revolving grip shaft (28 and 21, Figures 7-21 and 7-22 respectively) with an inserted key each (29 and. 22). The shoulder section of each revolving grip shaft is secured to the inner face off the wall hub section with two lock nuts each (30 and 23) on the outer face of the wall hub section. The lock nut engage on the threaded section of the revolving grip shaft to secure the revolving grip.

Both grips have a short undercut shoulder next to the inner art of the knurled section. The graduated index ring (31, Figure 7-21) is a sliding fit on the shoulder section of the left revolving grip (26) and is carried by the inserted actuating screw (28) placed through the elongated slot and in the tapped hole in the shoulder section. The power index ring (30, Figure 7-22) is a sliding fit on the shoulder section of the right revolving grip (19) and is secured with a power indicating screw (11).

Both grips are provided with bearing shoulder sections which are a sliding fit in the inner fixed grips of the training handle hinges (24 or 17).

  The inside of each grip is bored and has two counterbored sections with a 30 degrees chamfered section near the center part. The bore provides clearance over the spring barrel (25 or 18). The inner end of each grip is provided with a segment section which stops the revolving grip (26 or 19) when in contact with a segment stop screw (32 or 24) of the fixed grips and training handle hinges (24 or 17).

The segment section of the left revolving grip (26) consists of a narrow section with 275 degrees of the cylindrical shoulder wall section removed. The removed section allows the revolving grip free rotation for operation of the prism tilt mechanism. The segment section is provided with two tapped holes to carry the headless adjusting screws (20) and two perpendicular tapped holes in the face of the segment for the adjusting screw lockscrews (18). These lockscrews are headless screws, which secure the adjusting screws and maintain the adjustment. The adjusting screws project into the cutaway section sufficiently to permit the revolving grip to be adjusted. Adjustments are made to set the graduated index ring (31) to 10 degrees depression and 45 degrees elevation, with the coinciding stationary

 
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index line on the fixed grip (24) and the segment stop screw (32). A detent V-slot is placed on the inner bearing shoulder circumference of this revolving grip, opposite the center of the segment section for the detent indication of zero line of sight.

The right revolving grip (19) is provided with a narrow segment section with 117 degrees of the cylindrical section removed. The removed section allows the revolving grip free rotation for operation of the change of power mechanism. The segment section is provided with adjusting screws (13) and adjusting screw lockscrews (10) similar to the left revolving grip (19, Figure 7-21). Adjustments are made to set the power index ring (30) to high and low power, with the coinciding stationary index line on the fixed grip (17) and the segment stop screw (24).

b. Handle hinge and fixed grips. The two handle hinge and fixed grips deft and right (24 and 17) are made of cast phosphor-bronze material, with the same over-all length. The outer parts of both are rough diamond knurled, and when in the extended position provide the revolving grip sufficient length for leverage to turn the periscope through azimuth. The inner part of each fixed grip has a cast filleted section between the grip and the hinge sections. The hinge section is shaped similarly to an apron, with the contour of the main wall uniform with the inner circumference wall of 150 degrees. The side walls of each hinge angle section have projecting bosses on the inner and outer faces, with a reamed hole through the center axis of each boss, offset from the main centerline of the fixed grip section. The inner bosses of each are a sliding fit over the side walls of the cam projection section of the hinge brackets (23 or 16). The reamed holes of each side wall of the hinge section carry, a pivot screw (6), thus serving as hinge pivots to carry the fixed grip and its hinge through 90 degrees of rotation.

Both fixed grip sections, have two narrow undercut shoulder sections on their outer part. The small shoulder of the left fixed grip (24) carries half of the graduated index ring (31), a drag fit on this half, while on the right fixed grip (17) it carries half of the power index ring (30), a sliding fit on this half. The next larger shoulders of both fixed grips are each provided with a

  stationary index line. The stationary index line of the left fixed grip (24) is located on the outer circumference and is perpendicular to the front of the top centerline. Its location on the right fixed grip (17) is similar. The right fixed grip (17) has a tapped hole for the insertion of a power indicating screw (11) located to the rear of the top centerline and 90 degrees from the stationary index line.

The inside of both fixed grip sections has two counterbored sections. The small counterbored section provides clearance for the vertical movement of the bearing plate (34 or 26) with the outer part provided with a narrow threaded section. The internal threaded section carries the external threaded section of the spring barrel (25 or 18), secured with a lockscrew (19 or 12). The lockscrew extends into the tapped hole in the center of the threaded section from the tapped hole in the outer circumference of the knurled fixed grips (24 or 17).

The large counterbored section carries the inner moving part of the revolving grip shoulder bearing sections (26 or 19). In the bottom of each knurled fixed grip a clearance hole with a tapped section is provided near the inner depth of the large counterbored section for the revolving grip segment stop screws (32 or 24). The left fixed grip (24) is provided with a tapped hole near the center of the knurled section for a spring detent assembly to hold the line of sight at zero degree, and is located in the front centerline. Refer to the spring detent assembly of the Type II periscope,

The inside of the inner hinge section, from the small counterbored section, is provided with three equally spaced reamed holes. One is in the center axis to carry the stem section of the revolving grip shaft (28 or 21), while the other two reamed hole of the same size are located on opposite sides of the center reamed hole and are parallel. The two outer reamed holes are located in a perpendicular plane to the inner face of the projecting bosses of the side walls of the hinge section. Each outer reamed hole is counterbored a sufficient depth from the hinge section to carry the shoulder section of each plunger (35 or 27). The center reamed hole is counterbored sufficiently in the inside 150 degrees radius of the apron wall section to allow a flat surface for

 
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the assembly and the bearing contact of the outer bevel gear clutch collars (33 or 25). A clearance hole is provided in the apron wall of the bottom of each hinge section, to allow the gear clutch collar taper pins (22 or 15) to be removed for disassembly of the outer bevel gear clutch collars (33 or 25).

c. Index ring. The index ring (31, Figure 7-21) is made of brass tubing material of nominal wall thickness. The bore is a sliding fit over the shoulder section of the revolving grip (26) and is a drag fit over the shoulder section of the fixed grip shoulder section (24). The periphery is engraved after assembly to indicate specifically 10 degree depression, 0 degree line of sight, 45 degree elevation, and individual 1 degree graduations between the designed limits. A plus and minus indication is engraved above and below the 0 degree graduation. It is provided with a circumferential slot, located for the insertion of an actuating screw (38) in the tapped hole in the center of the shoulder section of the revolving grip. The circumferential slot has 3/32-inch angular movement to coordinate with the correction made with the adjusting screws (13) in the segment section of the revolving grip.

d. Power index ring. The power index ring (30, Figure 7-22) is made of brass tubing material of nominal wall thickness. The bore is a sliding fit over the shoulder, section of both the revolving grip (19) and lie fixed grip (17). The periphery has index marks: and the engraved letters of hp and lp above each index mark, located at assembly. The power index ring is secured to the shoulder section of the revolving grip (19) with a power indicating screw (11).

e. Hinge brackets. The two hinge brackets (23 and 16, (Figures 7-21 and 7-22 respectively) are made of cast phosphor-bronze material of duplicate design, with the base flange section shaped rectangular. A cam section projects upward from each base flange section. Both of these sections form the fixed half of the training handle hinge. Four raised bosses are provided in each corner of each base flange section, and each boss has a clearance hole in which the hinge bracket bolts (5) are inserted. The bolts extend into the tapped holes in each side of the eyepiece box to retain each hinge bracket. The lower face of each base flange section is provided with a counterbored

  section and a reamed hole, offset from the horizontal centerline. The reamed hole serves as a bearing for the inner bevel gear clutches (3) while the counterbored section provides clearance over the training handle stuffing box bodies (7, Figures 7-15 and 7-16 respectively) assembled in the eyepiece box. Two holes with body clearance and a tapped section are provided in the inner face of the counterbored section for two pivot screw lockscrews (20 and 13, Figures 7-21 and 7-22 respectively) to secure the pivot screws (6) when assembled in the side walls of each cam section.

The center cored section of each cam section is provided with a cylindrical raised boss, to carry the shoulder of the inner bevel gear clutches (3). Sufficient radius clearance is provided for assembly and removal of the inner and outer bevel gear clutches (3 and 4) and clearance inside the side walls for the 90 degrees rotation of the outer bevel gear clutch collar (33 or 25, Figures 7-21 and 7-22 respectively). The concave recesses are located for the folded position only, with the heavy tension on the set of plunger rollers retaining the handle beyond the high point of the cam. In the folded position, the spring pressure is at a minimum, and with the handle hinge swung downward in the extended position, the tension is increased, with the maximum tension reached at the highest point of the cams. Each set of rollers rides on the cams constantly because of heavy spring tension. When they pass the high point of the cam, the handle hinge and fixed grip of each will be returned to the folded position by the heavy recoil of the spring. The upper and lower part of the outer face of the base flange section is provided with leather cushions (14 and 15, Figure 7-21) or (7 and 8, Figure 7-22) secured with two lockscrews (17 or 9, Figures 7-21 and 7-22 respectively). The outer face of each cam section side wall is a snug fit between the apron side wall bosses of the hinge section of each handle hinge and fixed grip. Two tapped holes located in each side wall and in the main horizontal centerline are offset slightly, and carry hinge bracket pivot screws (6).

f. Training handle and hinge recoil principle. This recoil is provided as a safety device to return each training handle to the folded position when lowering the periscope in the well of the submarine. It also prevents damage to each

 
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handle when elevating the periscope. With training handles of the friction holding device type used in Types II and III periscopes, instances have occurred where the handles did not remain in the folded position and caught on the sides of the periscope well when the periscope was raised.

g. Leather cushions. The two leather cushions (14 and 15, Figure 7-21) or (7 and 8, Figure 7-22) are attached on the upper and lower part of the outer base flange section of the hinge brackets (23 or 16, Figures 7-21 or 7-22 respectively) next to the cam section. Two lockscrews (17 or 9) secure each leather cushion to its hinge bracket. They provide a cushion to absorb the heavy shock of the spring recoil of the hinge when in the folded and extended positions.

h. Pivot screws. The two pivot screws (6, Figures 7-21 and 7-22) are made of phosphor-bronze rod material. They form hinge pins on which the hinge section of the fixed grip can be swung through 90 degrees of rotation. Each screw has a head section, with the main body section a snug sliding fit in each of the hinge section pivot holes in each handle hinge and fixed grips (24 or 17, Figures 7-21 or 7-22, respectively). The stub section is threaded and engages into a tapped hole in each side wall of each set of cam sections. The lockscrews (20 or 13, Figures 7-21 or 7-22 respectively) prevent the threaded section of each pivot screw from unscrewing.

i. Spring barrels. The two spring, barrels (25 or 13, Figures 7-21 or 7-22 respectively) are made of brass rod material. They consist of an enclosed cylinder with a uniform wall thickness, and a reamed clearance hole in the load end shoulder center axis for the revolving grip shafts (28 or 21). The opposite end has a threaded flange section with uniform wall thickness. The coil plunger spring (37 or 29) is stabilized by the side walls of each spring barrel. The threaded flange section of each engages into the small counterbored threaded section in the handle hinge and fixed grips (24 or 17, Figures 7-21 or 7-22 respectively), after compressing 2 inches of coil plunger spring. It is secured with a lock Screw (19 or 12). Two opposite holes are provided in the outer load shoulder part of each spring barrel for the insertion of a special wrench to tighten the spring barrel against the heavy tension of the coil plunger spring.

  j. Coil plunger springs. The two coil plunger springs (37 or 29, Figures 7-21 or 7-22 respectively) are made of chrome-silicon manganese alloy steel material, and fit over the revolving grip shafts (28 or 21). Both load ends of the spring are ground, with one load end having tension against a spacer washer (27 or 20), and the other load end against the counterbored section seat in the bearing plates (34 or 26). The spacer washer offers a smooth surface to the load shoulder of the spring barrel when loading the spring. The spring when compressed places a 90-pound pressure on the high point of the cam. The pressure is decreased gradually as the handle hinge comes to the folded position. Each bearing plate in turn is distributing the same pressure on the assembled plungers and rollers (35 and 36, Figure 7-21) or (27 and 28, Figure 7-22).

k. Bearing plates. The two bearing plates (34 or 26, Figures 7-21 or 7-22 respectively) are made of phosphor-bronze rod material. They consist of a cylindrical plate with a clearance hole in the center axis that moves axially over the revolving shaft (28 or 21). Under spring tension each plate distributes equal pressure to their plungers (35 or 27). Two square broached holes are provided in the outer body for the square stub section of the plungers. The square section of the plungers and the square broached holes in the bearing plate maintain proper alignment for the plungers and rollers (35 and 36, Figure 7-21) or (27 and 28, Figure 7-22), preventing angular movement. The counterbored recess in each bearing plate centers the plunger springs (37 or 29) at the lower load end.

l. Plungers. The two plungers (35 or 27, Figures 7-21 or 7-22 respectively), are made of corrosion-resisting steel material. Both the main body sections are a close axial sliding fit in both reamed holes in the handle hinge and fixed grips (24 or 17). The hub section is slotted to carry a plunger roller (36 or 28) with a reamed hole perpendicular to the slotted section to carry each plunger roller pin (21 or 14). The pin provides a bearing for the plunger rollers and is riveted over at assembly. The large section of each plunger is milled on one side sufficiently to allow it to clear the inside boss of the hinge section side wall of each handle hinge and fixed grip. The square section of the plunger is cut parallel with the pivot pin hole and the slotted section.

 
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Each plunger roller is cylindrical with a reamed hole through its center axis for a plunger roller pin (21 or 14), and is a snug fit in the slotted part of the hub section. The plunger rollers roll on the hinge cams of the hinge bracket, and pass the high point of the cam against the tension of the plunger springs (37 or 29).

m. Revolving grip shafts. The two revolving grip shafts (28 or 21, Figures 7-21 or 7-22 respectively) are made of corrosion-resisting steel material. The shaft forms the connection between each revolving grip (26 or 19) through the spring barrels (25 or 18), plunger springs (37 or 29), bearing plates (34 or 26), handle hinge, and fixed grips (24 or 17) to connect with the outer bevel gear clutch collars (33 or 25) and each outer bevel gear clutch (4) at the opposite end. The outer bevel gear clutch collars (33 or 25) are secured to the stem section of each shaft with a taper pin (22 or 15) in the hinge section of the fixed grips. The square section of each shaft carries each outer bevel gear clutch (4) against the spring tension of each gear clutch spring (1) by means of each retaining screw (2). The retaining screw extends into a tapped hole in the square section of each shaft.

n. Outer bevel gear clutch collars. The outer bevel gear clutch collars (33 or 25, Figures 7-21 or 7-22 respectively) are made of phosphor-bronze material of short length. They provide a container in which each gear clutch spring (1) is carried. The collar has a reamed hole in its center axis with a counterbored section, and is secured to the stem section of each revolving grip shaft with a taper pin (22 or 15). Each gear clutch spring (1) is carried over part of the stem section and the square section of the revolving grip shafts (28 or 21). The spring places a constant pressure against the hub face of each outer bevel gear clutch (4).

o. Inner and outer bevel gear clutches. The two sets of inner and outer bevel gear clutches (3 and 4, Figures 7-21 and 7-22 respectively) are made of phosphor-bronze material. Both the bevel gear sections have the same diameter and number of teeth. Each is provided with a square broached hole. The square broached hole and the hub sections of the outer bevel gear clutch (4) move axially in the gear clutch collar (33 or 25) against each gear clutch

  spring (1) on the square section of each revolving grip shaft (28 or 21).

The hub section of the inner bevel gear clutch fits in the reamed hole in each hinge bracket (23 or 16), and further extends on the square section of the right and left training handle actuating shafts (8 or 4, Figures 7-15 or 7-16, respectively) of the training handle packing gland assemblies. It extends simultaneously over the square section of the shaft and in the counterbored recess in each packing retainer (6 or 8).

Each set of inner and outer portion bevel gear clutches is in mesh in either the folded or extended position by means of each gear clutch spring (1). In the folded position both sets of bevel gears are in relation to each other at 90 degrees, with both 45 degrees pitch cone line angles. In the extended position both sets of bevel gears act as universal jaw clutches with all teeth engaged for the operation of the prism tilt or the change of power mechanisms.

p. Detent plunger housing. The detent plunger housing (16, Figure 7-21) is made of brass-rod material, with an over-all length of 0.812-inch. It differs from the Type II periscope detent plunger housing (34, Figure 4-43) in several ways. It is 3/16 inch longer in order to provide a sufficient shoulder section. The shoulder section is provided with a square broached hole to accommodate the square section of the detent plunger (7, Figure 7-21). In the Type II periscope, this square hole provision was made in the training handle hinge (28, Figure 4-43).

7O2. Disassembly. The left or right training handle assembly is disassembled in the following manner:

1. Remove the two pivot screw lockscrews (20 or 13, Figures 7-21 or 7-22 respectively) from the counterbored section seat in the hinge bracket (23 or 16). These lockscrews are unscrewed from tapped holes in the base of the hinge bracket.

2. Place either training handle in the folded position before removing the two training handle pivot screws (6). This prevents damage to the outer bevel gear clutch (4) and reduces the spring pressure. The spring pressure in the folded position is at a minimum.

 
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3. Remove the two training handle pivot screws (6) from the handle hinge (24 or 17). The pivot screws are unscrewed from the tapped holes in the cam walls of the hinge bracket. Remove the handle hinge from its hinge bracket by tilting it upward to allow the outer bevel gear clutch teeth (4) to be removed from the inner clutch clearance recesses of the two cam side walls of the hinge bracket (23 or 16).

4. Remove the inner bevel gear clutch . (3) from the hinge bracket (23 or 16). It will slide out easily from the outer side.

5. Remove the detent plunger retaining bushing lockscrew (13, Figure 7-21) from the detent plunger retaining bushing (10). This lock screw is unscrewed from a tapped hole in the detent plunger retaining bushing and spotted recess in the detent plunger (7).

6. Remove the detent plunger retaining bushing (10) from the detent plunger (7).

7. Remove the plunger release knob (8) from the detent plunger housing (16) and detent plunger (7).

  8. Remove the detent plunger retaining spring bushing (9) using a special wrench, unscrewing it from the internal threaded section in the detent plunger housing (16).

9. Remove the detent plunger spring (11) and the detent plunger (7) from the detent plunger housing (16).

10. Remove the two revolving grip lock nuts (30 or 23) from the outer part of the revolving grip (26 or 19). Unscrew the first lock nut using a special wrench (Figure 7-23), then unscrew the second lock nut from the threaded periphery of the revolving grip shaft (28 or 21).

11. Remove the revolving grip (26 or 19) from the handle hinge and fixed grip (24 or 17) and the revolving grip shaft (28 or 21). Remove the graduated index ring (31) or power index ring (30) with the revolving grip (26 or 19). The two segment adjusting screws (20 or 13) and the segment adjusting screw lockscrews (18 or 13) should not be removed unless they are damaged.

Figure 7-23. Special revolving grip shaft locknut wrench.
Figure 7-23. Special revolving grip shaft locknut wrench.
 
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12. Remove the index ring actuating screw (38, Figure 7-21), unscrewing it from the tapped hole in the revolving grip (26) and carrying it out of the radial slot in the graduated index ring (31). Remove the graduated index ring. Remove the power indicating screw (11, Figure 7-22), unscrewing it from the tapped hole in the revolving grip (19) and power index ring. Remove the power index ring.

13. Remove either of the gear clutch retaining screws (2) from either of the outer portion bevel gear clutches (4) and the revolving grip shafts (28 or 21). The retaining screw is unscrewed from a tapped hole in either revolving grip shaft.

14. Remove either of the outer bevel gear clutches (4) and the gear clutch springs (1). Check either of the outer bevel gear clutches for reference marks with the square section of the revolving grip shafts (28 or 21). Should observations indicate that there are no reference marks, the repairman should mark the parts as they are disassembled for proper reassembly alignment.

15. Remove the taper pins (22 or 15) after rotating the revolving grip shaft (28 or 21) until the small end of the taper pin (22 or 15) is lined up with a drift clearance hole in its respective wall of the handle hinge and fixed grip (24 or 17).

16. Place a drift punch of suitable size in either small clearance hole in the fixed grip and handle hinge (24 or 17).

17. Drive either taper pin (22 or 15) from its gear clutch collar (33 or 25) and the revolving grip shaft (28 or 21).

18. Remove the bevel gear clutch collar (33 or 25) from the evolving grip shaft (28 or 21).

19. Remove the revolving grip shaft (28 or 21) with its inserted key (29 or 22) from the handle hinge and fixed grip (24, or 17).

20. Remove the spring barrel lockscrew (19 or 12) from the fixed grip of the handle hinge (24 or 17) and from its contact with the spring barrel (25 or 18). This lock screw is unscrewed from the tapped hole is the handle hinge and fixed grip.

21. Remove the revolving grip segment stop screw (32 or 24) from the fixed grip of the handle hinge (24 or 17). The stop screw is unscrewed

  from the tapped hole in the fixed grip of the handle hinge.

22. Remove the spring barrel (25 or 18) from the fixed grip of the handle hinge (24 or 17). Unscrew the spring barrel from the fixed grip of the handle hinge, using a special guide bushing and wrench in the load end. Figure 7-24 shows the guide bushing while Figure 7-25 shows the spring barrel wrench. Remove the spring barrel (25 or 18) coil plunger spring (37 or 29), and spring barrel washer (27 or 20).

23. Remove the two assembled plungers (35 or 27) consisting of the plungers, plunger rollers (36 or 28) and plunger roller pins (21 or 14) from the lower reamed holes in the handle hinge and fixed grip (24 or 17). Check reference marks of both plungers to insure proper reassembly alignment. Should observations indicate that there are no factory reference marks, the repairman should make reference marks at appropriate places at disassembly to provide for proper reassembly alignment.

24. It is not necessary to disassemble the plunger roller pins (21 or 14) and rollers (36 or 28).

25. Remove the bearing plate (34 or 26) from the fixed grip of the handle hinge (24 or 17).

26. It is not necessary to remove the detent plunger housing (16, Figure 7-21), and the detent plunger release knob lockscrew (12) from the inner grip of the handle hinge (24).

27. It is not necessary to remove the leather cushions (14 and 15) or (7 and 8) and lockscrews (17 or 9) from the hinge bracket (23 or 16).

7Q3. Reassembly. The left or right training handle assembly is reassembled in the following manner:

1. Check the factory reference marks on each plunger (35 or 27). The plunger should be replaced in the proper reamed hole in the handle hinge (24 or 17).

2. Reassemble the bearing plate (34 or 26) into the fixed grip of the handle hinge (24 or 17). Place the shallow counterbored section seat facing the plunger spring (37 or 29). Align the bearing plate so that its square broached holes fit on the square section of the plungers (35 or 27). The plungers should move freely with the bearing plate, as any tendency of tightening

 
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Figure 7-24. Spring barrel wrench guide bushing.
Figure 7-24. Spring barrel wrench guide bushing.
Figure 7-25. Spring barrel wrench.
Figure 7-25. Spring barrel wrench.
 
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would not insure positive spring action to the handle hinge, and would restrict the handle from returning to its folded position.

3. Reassemble the spring barrel washer (27 or 20) into the bottom of the spring barrel (25 or 18) and place the coil plunger spring (37 or 29) on its spring barrel washer.

4. Reassemble the spring barrel (25 or 18) in the fixed grip of the handle hinge (24 or 17). The plunger spring should be compressed sufficiently for the spring barrel to engage into the internal threaded part of the fixed grip of the handle hinge. Screw the spring barrel in until it rests on the shoulder of the fixed grip of the handle hinge, using a special guide bushing and wrench (Figures 7-24 and 7-25). The plunger spring is compressed approximately 1 1/8 inch.

5. Insert the spring barrel lockscrew (19 or 12), screwing it into a tapped hole in the fixed grip of the handle hinge (24 or 17) and further into the threads in the spring barrel (25 or 18).

6. Insert the revolving grip segment stop screw (32 or 24) into the fixed grip of the handle hinge (24 or 17). The segment stop screw extends into a tapped hole in the fixed grip of the handle hinge and projects further to allow the adjusting screws of the revolving grip segment to contact it for full elevation and depression as a stop screw and for high and low power magnification.

7. Reassemble the revolving grip shaft (28 or 21), with its inserted hey (29 or 22) into the spring barrel, (25 or 18), spring barrel washer (27 or 20), coil plunger spring (37 or 29), bearing plate (34 or 26), and handle hinge aid fixed grip (24 or 17).

8. Check the large taper pin hole in the revolving grip shaft (28 or 21) and the outer bevel gear clutch collar (33 or 25) for proper assembly of the collar on the shaft. Tap the collar on the revolving grip shaft (28 or 21) and insert a taper pin (22 or 15). The taper pin should not be drive into the collar and shaft excessively, as it will spread them.

9. Reassemble the outer bevel gear clutch spring (1) over the square section end of the revolving grip shaft (28 or 21) acid assemble the outer bevel gear clutch. (4) compressing the gear

  clutch spring. Insert the outer bevel gear clutch retaining screw (2) into a tapped hole in the inner end of the revolving grip shaft (28 or 21).

10. Reassemble the graduated index ring (31, Figure 7-21) on the inner shoulder of the revolving grip (26). Align the elongated circumferential slot over the tapped hole in the revolving grip.

11. Insert the index ring actuating screw (38) through the elongated circumferential slot in the graduated index ring (31) and screw it into a tapped hole in the revolving grip (26).

12. Reassemble the power index ring (30, Figure 7-22) on the inner end shoulder of the revolving grip (19). Align the tapped holes in the power index ring and the revolving grip and insert the power indicating screw (11) for the securement of the power index ring.

13. The segment adjusting screws (20 or 13) and the segment adjusting screw lockscrews (18 or 10) were not removed during disassembly. Therefore, it may be necessary to release the segment adjusting screw lockscrews (18 or 10) and make fine adjustments with the segment adjusting screws (20 or 13) to permit full elevation and depression of the head prism, the necessary slack allowance, and a positive engagement of the change of power mechanism.

14. Reassemble the revolving grip (26 or 19) with the assembled graduated index ring (31) or the power index ring (30) and the index ring actuating screw (38) or the power indicating screw (11) over the spring barrel (25 or 18) and the revolving grip shaft (28 or 21). Align the inserted key (29 or 22) in the revolving shaft with the keyseat in the revolving grip. Carry the revolving grip into the fixed grip of the handle hinge (24 or 17).

15. Reassemble both revolving grip lock nuts (30 or 23) on the threaded part of the revolving grip shaft (28 or 21). Secure each lock nut in turn with the special wrench (Figure 7-23).

16. Rotate the revolving grip (26, Figure 7-21) to carry the graduated index ring (31) so that the full elevation and depression position index lines coincide with a stationary index line on the fixed grip of the handle hinge (25). Insufficient or over-travel of the index ring can be corrected by the segment adjusting screws (20). The front adjusting screw provides correction for elevation

 
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while the rear adjusting screw provides correction for depression.

17. Rotate the revolving grip (19, Figure 7-22) to carry the power index ring (30) so that the high- and low-power index lines coincide with the stationary index line on the fixed grip of the handle hinge (17). Insufficient or excessive travel of the power index ring is described in Steps 7, 8, and 9 of Section 7V4.

18. Reassemble the detent plunger (7, Figure 7-21) into the square hole in the detent plunger housing (16). Check the detent plunger for proper reference marks so that the plunger 90 degrees angle point is placed in proper mesh to engage into a 90 degrees groove on the inner shoulder of the revolving grip (26).

19. Reassemble the detent plunger spring (11) and the detent plunger spring bushing (9) over the detent plunger shaft (7) and place them in the detent plunger housing (16). Using a special wrench, screw the detent plunger spring bushing into the internal threaded section in the detent plunger housing down to the shoulder. Check the detent plunger to insure that it moves freely.

20. Reassemble the plunger release knob (8) over the detent plunger shaft (7) and the detent plunger housing (16).

21. Reassemble the detent plunger retaining bushing (10) on the detent plunger shaft (7) and secure the above plunger retaining bushing with a lockscrew (13).

22. Reassemble the inner bevel gear clutch (3) into the reamed hole in the hinge bracket (23 or 16).

23. Reassemble the handle hinge (24 or 17) over the side walls of the hinge section of the hinge bracket (23 or 16). Carry the handle hinge in a sufficiently tilted position to allow the outer bevel gear clutch (4) to slide into the center clearance recesses in the inner hinge section

  walls of the hinge bracket. Carry the handle in the folded position, and check the inner and outer bevel gear clutch teeth (3 and 4) to make sure that their reference teeth engage properly.

24. The hinge bracket (23 or 16) should be held in a vise to enable the repairman to apply sufficient pressure on the two plungers (35 or 27) and the coil plunger spring (37 or 29). Reassemble both pivot screws (6) into the walls of the hinge section. The pivot screws extend into the tapped holes in the walls of the hinge bracket hinge section (23 or 16).

25. Reassemble the two lockscrews (20 or 13) into the counterbored section seat in the base of the hinge bracket (23 or 16). The lockscrews extend into the body clearance holes and tapped holes in the counterbored section seat in the base of the hinge bracket (23 or 16).

26. Rotate the knurled plunger release knob (8, Figure 7-21) to the observing position.

27. Turn the revolving grip (26) slowly to observe the detent action. The detent should engage at 0 degree elevation.

28. Insufficient or over travel of the zero graduation can be corrected by the two adjusting screws located in the segment section of the revolving grip (26).

29. To make the necessary adjustments to either training handle assembly requires the disassembly of both revolving grip locknuts (30 or 23) and the removal of the revolving grip (26 or 19).

30. The correction of the detent of the left training handle assembly cannot be made until its graduated index ring (31, Figure 7-21) has been corrected for elevation and depression.

31. Both training handle assemblies are adjusted during the procedure outlined in Section 7V4.

 
R. HOISTING YOKE ASSEMBLY (ELECTRIC AND HYDRAULIC)
 
7R1. Description. A hydraulic hoist has been designed to ensure the operational security of a submarine. It permits silent operation plus split second timing for the vertical travel of the periscope to and from the observing position.

The alteration of the hoisting yoke used with the electric hoisting system for use in the

  hydraulic hoisting system is easily accomplished. It necessitates the removal of various parts consisting of the phosphor-bronze locating collar (9, Figure 7-26), lower ball bearing race (8), split ring (3), cover ring (2), and wire rope sleeves (11). Suitable replacements consisting of a new lower ball bearing race (18), split ring (17), cover ring (16), and various additions such as two
 
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bracket connectors (19), limit stop (22), and two locknuts (21) constitute the hydraulic hoisting yoke.

The electric and hydraulic hoisting yoke assemblies are described in the sections discussing their use. Figure 7-26 shows the electric and hydraulic hoisting yoke assemblies. All bubble numbers in Section 7R1 refer to Figure 7-26 unless otherwise specified.

Ill.
No.
Drawing
Number
Num-
ber Re-
quired
Nomenclature
1 P-1326-1 1 Hoisting yoke body (electric and hydraulic)
2 P-1326-2 1 Cover ring (electric)
3 P-1326-3 2 Split ring halves (electric)
4 P-1326-4 3 Cover ring lockscrews (electric and hydraulic)
5 P-1326-5 4 Spherical movement and guide stop lockscrews (electric)
6 P-1327-1 2 a. Upper ball bearing race (electric and hydraulic)
7 P-1327-1 2 b. Ball bearings by retainer (electric and hydraulic)
8 P-1327-1 1 c. Lower ball bearing race (electric)
9 P-1327-1 1 d. Phosphor-bronze locating collar (electric)
10 P-1327-2 2 Adjusting nuts for wire rope and hydraulic bracket connectors (electric and by hydraulic
11 P-1327-3 2 7/16 inch wire rope sleeves (electric).
12 P-1327-4 2 Adjusting nut lockscrews (electric)
13 P-1327-5 2 Spherical movement guide stops (electric).
14 P-1327-6 2 Spherical movement stops (electric)
15 P-1448-7 1 Zerk grease fitting (electric and hydraulic)
16 P-1519-1 1 Cover ring (hydraulic)
17 P-1519-2 2 Split ring halves (hydraulic)
18 P-1519-3 1 Lower ball bearing race (hydraulic)
19 P-1520-1 2 Bracket connectors (hydraulic)
20 P-1520-2 2 Plunger rod locknuts (hydraulic)
21 P-1520-3 2 Bracket 11 connector locknuts (hydraulic)
22 P-1520-4 1 Limit stop (hydraulic)
23 P-1520-5 4 Limit stop lockscrews (hydraulic)
24 P-0-0 2 Plunger rods (hydraulic)
  a. Hoisting yoke body. The hoisting yoke body (1) is made of corrosion-resisting steel material and is utilized for both the electric and hydraulic hoists. It is cylindrical in shape with two cable projections located 180 degrees apart. The outer body tapers inward from its large diameter with rounded corners, thus offering a smooth surface for safety to personnel when lowering the periscope in the well of the submarine. Two cable projections are bored tapered with the lower face of each having a spherical counterbored seat. The spherical seat accommodates the spherical face of each wire rope adjusting nut (10) or the hydraulic bracket connector adjusting nuts (10) of the hydraulic hoisting yoke. Each cable projection has a 15 degrees angle slot for assembly of the 7/16-inch wire rope. Both cable projections are utilized for the hydraulic plunger rods by the attachment of two bracket connectors (19) thus transferring the electric cable center distance to the greater center distance of the bracket connectors for connection with the plunger rods (24) of the hydraulic system.

The internal part is bored with sufficient clearance for assembly around the body tube of the periscope. The lower face is beveled outward at 30 degrees to allow the spherical movement required with the self-aligning thrust bearing of the electric hoisting yoke. Four equally spaced recesses are provided in the bottom face for assembly of the spherical movement and guide stops (14 and 13) with each stop secured with two lockscrews (5).

The small counterbored section carries the phosphor-bronze locating collar (9) for the electric hoisting yoke, and the lower ball bearing race (18) for the hydraulic hoisting yoke. The large counterbored Section area directly above the small counterbored section, serves as clearance to allow the lower spherical face of the lower ball bearing race sufficient spherical alignment. The lower face of the large counterbored section is beveled at a 45 degrees angle, to permit sufficient clearance for the electric hoisting yoke thrust bearing. This large counterbored section area has no special purpose for the hydraulic hoisting yoke other than serving to utilize the same hoisting yoke body. The small counterbored section and the large counterbored section area carry the upper ball bearing race (6), ball bearings and retainer (7), lower ball bearing,

 
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spherical race (8) and phosphor-bronze locating collar (9) called the self-aligning thrust bearing. For the hydraulic hoisting yoke it carries the upper ball bearing race (6), ball bearings and retainer (7), and lower ball bearing race (18) of the thrust bearing.

The small counterbored and threaded section above the large counterbored section area provides a sufficient threaded section to carry the cover ring (2) of the electric hoisting yoke. The outer tapered wall of the hoisting yoke body

  is provided with four tapped holes for the assembly of a limit stop (22) for the hydraulic hoisting yoke. The centerline of the stop is located 72 degrees from the cable projection, and is secured with four lockscrews (23).

The upper face is provided with two tapped holes spotted at assembly to carry the cover ring lock-screws (4).

The outer wall is provided with a drilled clearance hole and a larger tapped hole section for the insertion of a Zerk grease fitting (15).

Figure 7-26. Hoisting yoke (electric and hydraulic).
Figure 7-26. Hoisting yoke (electric and hydraulic).
 
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b. Self-aligning thrust bearing. The self-aligning thrust bearing for the electric hoisting yoke consists of four parts divided in the following manner: upper ball bearing race (6), 38 half inch ball bearings and retainer (7), lower ball bearing race (8), and phosphor-bronze locating collar (9). It is subdivided for description in the following manner:

1. Upper ball bearing race. The upper ball bearing race (6) is one part of four component parts which constitute the self-aligning thrust bearing. It is made of SAE 52100 steel material, hardened and ground. (Refer to the factory detail drawing.) This race is cylindrical in shape, with a bored hole and counterbored section. The bored hole has nominal clearance over the outer tube (2, Figures 4-15, 6-2, and 7-2). The periphery is beveled at a 35 degrees angle to allow sufficient clearance inside the yoke for self-alignment, with a narrow shoulder section of the periphery remaining to maintain sufficient wall strength. The counterbored section carries both halves of the assembled split ring (3) which fits in the undercut groove in the lower part of the outer tube body. The lower face of the race has a cylindrical concave groove 1/16 inch deep and a pitch diameter of 8.470 inches. All sharp corners are stoned off to prevent cracking and chipping the cylindrical concave groove in its lower face rests on the 38 half-inch ball bearings in the retainer (7).

2. 38 half-inch ball bearings and retainer. The 38 half-inch ball bearings and retainer (7) are a part of the self-aligning thrust bearing made of stainless steel material and are located in a bronze retainer with 38 equally spaced ground spherical seats. The ball bearings roll between the cylindrical concave grooves in both the upper and lower ball bearing races (6 and 8) in the electric hoisting yoke, to carry the weight of the periscope. The bronze retainer is cylindrical with a bored hole. It has a nominal clearance over the outer tube, and a nominal wall thickness, with all sharp corners beveled.

3. Lower ball bearing race. The lower ball bearing race (8) is a part of the self-aligning thrust bearing and is made of the same material as the upper race. It is shaped cylindrically with a spherical convex face.

  It is bored with nominal wall thickness over the outer tube. The lower face and the periphery have narrow shoulder sections to provide sufficient wall strength. The upper face has a cylindrical concave groove of the same design as the upper race. All sharp corners are stoned off to prevent cracking and chipping. The spherical convex face rests in the spherical seat of the phosphor-bronze locating collar.

4. Phosphor-bronze locating collar. The phosphor-bronze locating collar (9) is a part of the self-aligning thrust bearing. It is cylindrical in shape and is bored with sufficient clearance to allow approximately 3/8 inch self-alignment on each side. The periphery is a sliding fit in the small counterbored section in the hoisting yoke body (1). The collar has a spherical concave seat to carry the thrust bearing parts (6, 7, and 8).

The self-aligning thrust bearing assembled in the hoisting yoke body serves to carry the weight of the periscope plus the downward force created by the water pressure acting on the periscope. It also allows the periscope to turn easily through azimuth. The self-alignment principle serves to provide a means for equalizing any difference of the wire rope cable lengths which would otherwise result in the binding of the thrust bearing. The self-alignment bearing and clearance provided allow for a shortening or lengthening of each cable of 0.218 inch or a cable differential of 0.437 inch.

c. Thrust bearing. The thrust bearing of the hydraulic hoisting yoke is similar to the self-alignment thrust bearing, as it utilizes the upper ball bearing race (6) and 38 half inch ball bearings and retainer (7). The lower ball bearing race (8) and phosphor-bronze locating collar (9) are omitted. A new lower ball bearing race (18) is made of the same material as the upper race (6). The race is cylindrical, with a bored hole having sufficient wall thickness to carry the weight of the periscope. All corners are chamfered to strengthen the race, thus preventing it from cracking as a result of the shock created by the hydraulic hoist system. The upper face is provided with a cylindrical concave groove similar to the lower face of the upper ball bearing race (6). This race fits into the small counterbored

 
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section in the hoisting yoke body (1) with side clearance.

d. Split ring. The split ring (3) for the electric hoisting yoke is made of phosphor-bronze material. It is shaped cylindrically, with the flange section undercut a tap fit in the counterbored section in the upper ball bearing race. The bore conforms to the undercut diameter of the outer tube undercut groove, with the width of the inner shoulder a tap fit in the above groove.

The flange section is counterbored with a spherical concave seat with an additional filleted cylindrical recess. The spherical concave seat allows the split ring sufficient clearance inside of the counterbored spherical overlapping guide section of the cover ring (2). The split ring carries the weight of the periscope in the counterbored section in the upper ball bearing race (6).

e. Split ring. The split ring (17) for the hydraulic hoisting yoke is made of phosphor-bronze material of nominal wall thickness. It is made cylindrical with the bore conforming to the undercut diameter of the outer tube undercut groove, and the width of the split ring a tap fit in the above groove. The ring is slotted through its center axis, for assembly to the outer tube. Both halves of the split ring serve the same purpose as the split ring (3) of the electric hoisting yoke, that of carrying the weight of the periscope. The counterbored section of the upper ball bearing race (6) is a tap fir over both assembled halves of the split ring.

f. Cover ring. The cove ring (2) for the electric hoisting yoke is made of phosphor-bronze material add is shaped cylindrically. The periphery is provided with a narrow flange section in which two clearance holes are countersunk for the lockscrews (4). These lockscrews secure the cover ring after adjustments have been made for the proper clearance. The undercut threaded, section of the cover ring engages in the internal threaded section in the hoisting yoke body (1) the upper part has a raised overlapping guide section bored with sufficient clearance around the outer tube for self-alignment. The inside is counterbored at an angle of 16 degrees to the depth of the filleted section, with an additional counterbored section beveled at 37 degrees.

  Both beveled sections allow the thrust bearing sufficient clearance for self-adjustment.

The spherical overlapping guide section is provided with a spherical convex shoulder that rests snugly on the spherical flange section of the split ring (3). The upper face is provided with eight equally spaced holes of shallow depth on an 8 1/2-inch diameter circle for the insertion of projecting pins of a spanner wrench used in the assembly or removal of the cover ring. The cover ring secures the hoisting yoke together, thus retaining the thrust bearing against the split ring halves with sufficient clearance for free rotation.

g. Cover ring. The cover ring (16) for the hydraulic hoisting yoke is made of phosphor-bronze material and is shaped cylindrical. The periphery is provided with a flange section with an undercut threaded section. The threaded section engages into the internal threaded section in the hoisting yoke body (1). The ring is bored with sufficient clearance over the outer tube, with a counterbored section to allow sufficient wall thickness. A small cylindrical shoulder is provided for the adjustment of the thrust bearing, so that it has sufficient free rotation. The upper face is beveled at a 45 degrees angle toward its bore, allowing a narrow shoulder section. The upper face of the ring has eight equally spaced holes of shallow depth for the projecting pins of a spanner wrench, to assemble or remove the cover ring.

h. 7/16-inch wire rope sleeve. The two 7/16-inch wire rope sleeves (11) are made of corrosion-resisting steel material. The body section of each has the periphery threaded to carry adjusting nuts (10). Two opposite vertical slots are provided 180 degrees apart in the threaded section, the entire length and are cut to a depth below the root of the threads. The recess slot on each side receives the inserted adjusting nut lockscrew (12) which extends inward from the adjusting nut. Each half turn for adjustment of the adjusting nut can be secured by the lockscrew to maintain its adjustment.

The square section located in the lower part provides a means for attaching a wrench, thus restricting the sleeve from turning while taking up the adjusting nut, and preventing any twist in the wire rope. A narrow undercut radius

 
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groove next to the square section allows the adjusting nut to be carried to the square section for full travel on its threaded periphery of the sleeve.

The center axis of each has a reamed guide hole of short length for the wire rope, with the lower part tapered. The wire rope is inserted through the reamed hole and extends a sufficient length for spreading. The strands are back spliced, and separated after splicing, to provide an enlargement in the tapered section. The wire rope is now carried back with the built-up section in the tapered part of the sleeve. The sleeve is heated and filled with molten lead, which adheres to the separated wire rope strands and fills up the tapered section. It also adheres to the bored tapered walls of the sleeve. The lead prevents the wire rope strands from unraveling and provides a positive means of supporting the weight of the periscope. The sleeves are assembled in the cable projections of the hoisting yoke body (1) with the weight of the periscope carried on the convex face of the adjusting nuts in contact with the lower concave seat in each opposite cable projection.

i. Adjusting nuts. The two adjusting nuts (10) are made of corrosion-resisting steel material of hexagon design. The upper face of each nut is provided with a convex face and fits into the lower seat in each cable projection of the hoisting yoke body (1). The center axis is provided with a bored and tapped hole, and engages on the threaded periphery of the 7/16-inch wire rope sleeves (11). The adjusting nut provides the adjustment to the wire rope with a tapped hole in one of the hexagon flats for the insertion of an adjusting nut lockscrew (12). This lockscrew maintains each half turn of adjustment, thus preventing slack in the wire rope. The adjusting nuts are used for the hydraulic brackets by not using the lockscrews (12) but using two additional locknuts (21).

j. Spherical movement guide stops. The two spherical guide stops (13) are made of corrosion-resisting steel material of nominal thickness, width, and length. Two clearance holes with counterbored recesses are provided for lockscrews (5). Two corners of the stop are rounded for assembly in recesses 180 degrees apart in the lower face of the hoisting yoke body (1). The guide stops

  project inward to the center axis of the hoisting yoke, and are provided with sufficient clearance over the outer tube of the periscope to guide the self-aligning bearing and restrict its movement in two directions.

k. Spherical movement stops. The two spherical movement stops (14) are similar to the spherical movement guide stops (13) in length and thickness. The clearance holes and counterbored recesses are similar, and are attached to the recesses 180 degrees apart and perpendicular to the recesses for the spherical movement guide stops (13). The movement stops are narrower in width, and are provided with a concave seat conforming to the contour of the outer tube. The spherical movement stops when assembled project inward toward the axis of the outer tube of the periscope to restrict the self-alignment of the thrust bearing to 3/8-inch movement.

l. Bracket connectors. The two bracket connectors (19) for the hydraulic hoisting yoke are made of corrosion-resisting steel material. Each bracket connector has an offset section for connection to the plunger rods of the hydraulic hoist. By utilizing the electric hoisting yoke body (1) and using both cable projections, it was necessary to design an offset bracket to accommodate the greater center distance of both hydraulic hoist plunger rods (24).

The large flange section of the bracket connector is concentric with the part attached to the cable projections of the hoisting yoke body (1). The large flange section is sufficiently thick with the connector section offset from the center axis a distance of 5/8-inch. The offset connector section is cylindrical, with a tapped hole in its axis of sufficient depth to carry the threaded part of the plunger rods (24) of the hydraulic hoist. The large flange section rests on the face of the cable projection, with a concave section of the shoulder removed to allow sufficient clearance for the removal of the cover ring (16). The removed section is located opposite the offset connector section, and has a concave seat to conform to the contour of the cover ring.

The taper section below the large flange section fits in the tapered hole in each cable projection of the hoisting yoke body (1) with a threaded section that carries an adjusting nut (10) and a locknut (21). The plunger rods (24)

 
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of the hydraulic hoist are secured in the offset section of each bracket connector with a locknut (20).

m. Limit stop. The limit stop (22) for the hydraulic hoisting yoke (1) is made of phosphor-bronze material. The stop is made from a section of a large cylindrical ring having a flange section. The ring is bored and counterbored with a 14 degrees 2' wall to conform to the periphery of the hoisting yoke. The counterbored section has a stepped shoulder that rests on the upper face of the hoisting yoke body. Four clearance holes are provided in the wall to secure the stop to the periphery of the hoisting yoke body, by means of four tapped holes spotted at assembly for lockscrews (23). Refer to the hoisting yoke body plan for the correct location of the limit stop. The cylindrical ring will produce 21 full limit stop pieces which are cut at approximately an angle of 16 degrees 28' width. The flange section is finished with a 7-inch radius located from a 12.250-inch diameter circle.

The limit stop of the hoisting yoke body serves to restrict the elevation of the periscope at the observing position. When the periscope is elevated to the observing position by means of the TO RAISE position of the ship's hydraulic system control valve, the limit stop contacts the operating linkage of the control valve. The linkage shifts the control valve to the NEUTRAL position, closing the supply and return ports. The trapped oil in the lower part of the plunger pistons in the cylinders will hold the periscope in the elevated position.

7R2. Operation of hydraulic control valve of the hydraulic hoist system. The control valve of this

  system has three positions, namely: TO RAISE, NEUTRAL, and TO LOWER.

1. The NEUTRAL position of the control valve allows the supply and return ports to remain closed.

2. The TO RAISE position of the control valve allows the supply port to open to the high-pressure side of the ship's hydraulic system. The high-pressure system supplies sufficient oil volume below the plunger pistons for elevation. This volume of oil below the pistons is under an approximate pressure of 600 psi.

3. The TO LOWER position of the control valve closes the supply port, and the return port is open to the low-pressure side of the hydraulic system. The weight of the periscope action on the volume of oil below the plunger pistons allows the periscope to be lowered into the well against the oil in the cylinders at a slightly faster rate of speed than for elevation.

There is no limit stop in the well to restrict the lowering of the periscope. The bumper is the only stop and when contacting the bumper, the periscope has an approximate bounce of 3/8-inch. Elevation of the periscope is accomplished in approximately eleven seconds, while it is lowered in approximately seven seconds.

The pressure on the return side of the hydraulic system, plus whatever friction exists in the return piping, is the resistance pressure on which the plunger pistons allow the periscope to be lowered of its own weight.

 
S. OPTICAL SYSTEM
 
7S1. Principles of periscope systems. The principles discussed in Section 4U1 apply equally well to the Type IV periscope except as noted below:

a. Magnifying power. While both, powers are the same as those of the Type II or Type III, the arrangement of telescopes in the Type IV for obtaining the 6X and 1.5X magnifications is different; therefore, omit the list of component telescopes in Section 4U1, 2 and substitute the following list:

 
Low
Power
High
Power
Galilean telescope1/4 Xout
Upper main telescope1/3.56 X1/3.56 X
Lower main telescope21.2 X21.2 X
 (Combined product)1.5 X6 X

b. Field of view. Same as Type III.

c. Image brightness.

 
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1. Absorption-reflection losses. In respect . to transmission efficiency, the Type IV is practically the same as the Type III. See Section 6S1, 3a.

Type IV Periscope Low
Power
High
Power
Total of axial thicknesses248 mm233 mm
No. of air-crown surfaces1514
No. of air-flint surfaces118
No. of silvered-glass surfaces22

Sources of loss and the transmission resulting therefrom are:

Absorption, by glass73.20%76.70%
Reflection, by glass-air28.31%35.09%
Reflection, silver-glass88.36%88.36%
Theoretical TRANSMISSION
(not coated)
18.8%23.8%

No figures are available for actual measurements of the Type IV with optics uncoated and coated; however, approximately double the above percentages of incident light would be transmitted if the optical elements have the magnesium fluoride coating.

2. Effect of pupillary size. In respect to the effect of pupillary size, see Section 4U4, b. The Type IV periscope is designed for night use and, consequently, differs from the preceding two types in that it has an exit pupil of 7-mm diameter, whereas the exit pupil of the two day periscopes is 4 mm in diameter. If the same amount of light were to enter, for example, the Type II and the Type IV, the latter would permit about 3 times as much light (49/16) to emerge because of the larger area of it exit pupil. It must bet remembered, however, that at night there is usually a great deal less light at the target.

Also, the exit pupil of the Type IV is not quite a full circle inasmuch as the two main objectives have a minor chord segment ground off each to permit space in the instrument for the waveguide. The area then of the actual exit pupil is only 99.5 percent of what it would be if the two objectives were full circles. Actually, the, deformity of the exit pupil is not apparent at the eye point.

3. Central and oblique brightness. This is essentially the same as that in the Type II.

  See Section 4U4-c. The portion of oblique raybundles that are lost because of the cut-off segments of the two main telescope objectives is small compared to the total amount of light that is transmitted.

d. Head prism. The head prism is identical to that in the Type III, except that it is larger, thus allowing a 42-mm entrance pupil.

7S2. Principles of target ranging devices. For principles of the telemeter, refer to Section 4U7-a. Omit Section 4U7, b, because the Type IV periscope is not equipped with a lower (split) objective lens or stadimeter.

The ranging in the Type IV is accomplished by means of an ST electronic device, which is attached to the base of the periscope.

7S3. Optical maintenance. a. Arrangement of optical elements. See Figure 7-27, page 378.

b. Method of tracing rays. This section is similar to the Type III. See Figure 7-27, page 378.

c. Method of removing parallax caused by gas pressure. This section is identical to the Type III except for the distances the various lenses must be shifted:

1. For all the lenses following the telemeter lens, the periscope eyepiece lens, before gassing, must be shifted toward the lower objective lens an amount equal to 1.25 mm. This is accomplished by setting the eyepiece lens to -0.25 diopters. Then, after the instrument is gassed and the eyepiece shifted back to its zero setting, it will be found that there is no parallax in that part of the system following the telemeter lens.

2. To compensate 1for lenses preceding the telemeter lens, the following target distances are used:

Type IV PeriscopeTarget Distance
Periscope in high power4,800 feet
Periscope in low power62 feet

The setting of the image-forming optics must first be performed for the system in high power. This setting of the upper-main-telescope eyepiece lens must not be disturbed when the low power compensation is undertaken.

 
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T. REASSEMBLY OF THE UPPER AND LOWER TELESCOPE SYSTEMS AND GALILEAN TELESCOPE SYSTEM
 
7T1. Reassembly of the upper and lower telescope systems and skeleton head assembly. This procedure is performed in the following manner: 1. Reassembly of the upper telescope system Part I together with Part II. Reassemble the upper part of the sixth inner tube section upper end coupling (4, Figure 7-7), in the lower part of the seventh inner tube section (79, Figure 7-6). Check reference marks of both the sixth inner tube section upper end coupling and the seventh inner tube section for proper reassembly alignment. Secure them together by the insertion of 24 lockscrews (87). These lockscrews are inserted in countersunk clearance holes in the lower part of the seventh inner tube section and screwed into tapped holes in the upper alignment section of the sixth inner tube section upper end coupling.

2. Reassembly of the lower telescope system Part I together with the upper telescope system Part II. Reassemble the upper part of the third inner tube section (1, Figure 7-10) on the lower part of the fourth inner tube section lower end coupling (40, Figure 7-7). Check reference marks in similar manner to Step 1. Secure them together by the insertion of 24 lockscrews (10, Figure 7-10). These lockscrews are inserted in countersunk clearance holes in the upper part of the third inner tube section an screwed into the tapped holes in the lower alignment support section of the fourth inner tube section lower end coupling.

3. Reassembly of the lower, telescope system Part II eyepiece skeleton assembly together with the lower telescope system Part I. Reassemble the eyepiece skeleton (42, Figure 77-11) to the lower flange of the first inner tube section Figure 7-10). The alignment dowel pin (37, Figure 7-10) in the lower flange of the first inner tube section engages in a reamed hole in the upper small shoulder flange of the eyepiece skeleton to reestablish the factory alignment. Secure both flanges together by the insertion of seven lockscrews (40, Figure 7-11). These lockscrews are inserted in clearance holes in the upper flange of the eyepiece skeleton and screwed into the tapped holes in the lower flange of the first inner tube section.

  4. Reassembly of the head prism drive shaft section and its continuations. Reassemble the head prism drive shaft section (61, Figure 7-6) and its continuations (4 and 15, Figure 7-10) to the connection point located at the upper part of the first inner tube section (31). The shaft section continuations are carried upward through various clearance holes in the coupling flanges and the head prism drive shaft guides which are attached to or part of the second, third, fourth, fifth, sixth, seventh, and eighth inner tube sections. The head prism drive shaft noise eliminators are reassembled to the head prism drive shaft section and its continuation at the second, fourth, fifth, sixth, and eighth inner tube sections. The head prism drive shaft section and its continuations can be reassembled at the lower part of the first reduced tube section as the connection point and then carried downward; however, in this manner it is carried through in the inverse order to that used with the upward method.

5. Reassembly of the head prism drive shaft and its continuations. Reassemble the head prism drive shaft (33, Figure 7-10) and its continuation (48, Figure 7-11) with the assembled head prism drive shaft universal coupling (34, Figure 7-10) to the connection point located at the upper part of the first inner tube section. The lower stub end of the shaft continuation (48, Figure, 7-11) with the inserted woodruff key (46) is carried downward through the elongated holes in the lower flange of the first inner tube section (31, Figure 7-10) and the small and large flanges of the eyepiece skeleton (42, Figure 7-11). Check the alignment of the inside keyway of the universal coupling, turning the shaft continuation for proper engagement of the inserted woodruff key.

6. Reassembly of the lower end of the long head prism drive shaft section to head prism drive shaft universal coupling. The stub end of the head prism drive shaft section continuation (15, Figure 7-10) should be slid clear of the upper flange of the first inner tube section to allow the upper part of the head prism drive shaft universal coupling (34) to swing next to the wall of the first inner tube

 
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section. Check the taper pin holes of both the stub end of the shaft continuation and the universal coupling before assembly. Insert the taper pin (36) in the lined up holes of the assembled universal coupling and the shaft continuation (15).

7. Reassembly of the assembled head prism drive shaft sections. Reassemble the assembled head prism drive shaft section (21, Figure 7-6) and its shaft continuation (30) with the attached spherical bushing (49) and head prism drive shaft universal coupling (45). The lower half of this assembly is attached to the head prism drive shaft section (43), the attached spherical bushing (58), its shaft continuation (52) with the attached head prism drive shaft universal coupling (54). Carry the above assembled arts to the connection point located at the lower part of the first reduced tube section (51) and place them through the flange clearance holes in the 1st, 2nd, 3rd, and 4th reduced tube sections (51, 42, 28, and 20).

8. Reassembly of the upper end of the long head prism drive shaft section to the head prism drive shaft universal coupling. Check the taper pin holes in the lower part of the head prism drive shaft universal coupling (54, Figure 7-6), and the stub section of the head prism drive shaft section (61). After alignment, reassemble the stub section of the shaft in the lower part of the coupling and insert the taper pin (56).

9. Follow the procure of Step 1 in Section 7F4 to clean the fifth reduced tube section (1) and the upper eyepiece lens mount (18) and its clamp ring (6).

10. Follow the procedure of Step 10 in Section 7F4 to clean the upper eyepiece lens (2).

11. Reassembly of the fifth reduced tube section. Place the upper eyepiece lens (2) in the upper eyepiece lens mount (18) with its flint element resting in the shoulder seat of the mount.

a. Screw the upper eyepiece lens clamp ring (6) into the internal threaded section in the upper eyepiece lens mount (18) against the crown element of the upper eyepiece lens (2). The lockscrew holes of the mount and clamp

  ring should coincide when the upper eyepiece lens is tightened sufficiently.

b. Insert and secure the upper eyepiece lens clamp ring (6) with its lockscrew (12). Insert the lockscrew in a countersunk clearance hole in the mount and screw it into the tapped hole in the clamp ring.

c. Place the assembled upper eyepiece lens mount (18) in the lower part of the fifth reduced tube section (1), and ascertain that the clamp ring faces downward.

d. Insert the upper eyepiece lens mount axial alignment screw (9) in the axial slot in the fifth reduced tube section (1), and screw it in the tapped hole in the upper eyepiece lens mount (18).

(12. Reassembly of the fifth reduced tube section to the fourth reduced tube section. Reassemble the lower flange of the fifth reduced tube section to the upper flange of the fourth reduced tube section. The head prism drive shaft universal coupling (23) is carried through a clearance hole in the upper flange of the fourth reduced tube section as is the alignment dowel pin (15) to engage in a reamed hole in the same flange. The dowel pin reestablishes the factory alignment. The alignment projection of the lower flange of the fifth reduced tube section extends into the upper part of the fourth reduced tube section. The lower part of the head prism drive shaft universal coupling (23) is reassembled to the stub section of the upper part of the head prism drive shaft section (21) as the fifth reduced tube section is reassembled, checking the alignment of the taper pin holes of the coupling and the shaft.

a. Secure the fifth reduced tube section (1) to the fourth reduced tube section (20) by the insertion of six lockscrew (10). These lockscrews are inserted in clearance holes in the lower flange of the fifth reduced tube section and screwed into tapped holes in the upper flange face of the fourth reduced tube section.

b. Secure together the lower part of the head prism drive shaft universal coupling (23) and the stub section of the head prism drive shaft section (21) by the insertion of a taper pin (26).

13. Reassembly of the skeleton head assembly to the upper flange of the fifth

 
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reduced tube section. Reassembly of the skeleton head assembly (Figure 7-5) to the upper flange of the fifth reduced tube section (1, Figure 7-6) proceeds in the following manner: Depress the head prism (1, Figure 7-5) to full depression and turn the quadruple screw shaft (16, Figure 7-6) carrying the quadruple screw follower (3) to the position used for disassembly of the skeleton head, which is the full elevated position.

a. Reassemble the head prism actuating rack (65, Figure 7-6) and engage its dowel pins (56) in the reamed dowel pin holes in the quadruple screw follower (3, Figure 7-6). Reassemble the skeleton head assembly to the upper flange of the fifth reduced tube section (1). As the skeleton head reamed alignment dowel pin hole engages on the dowel pin (15) projection of the fifth reduced tube section, it reestablishes factory alignment. The head prism is slowly shifted to full elevation. When the flange faces of both the skeleton head and the fifth reduced tube section

  are in contact, the quadruple screw shaft (16) is turned to depress the head prism (1) sufficiently to relieve any strain in its mechanism in the full elevated position.

b. Support the skeleton head assembly while insetting the six lockscrews (10). These lockscrews are inserted in clearance holes in the upper flange of the fifth reduced tube section and screwed into the tapped holes in the base of the skeleton head.

c. Insert the three lockscrews (41, Figure 7-5) in the clearance holes in the head prism actuating rack (65). These lockscrews are screwed into tapped holes in the quadruple screw follower (3, Figure 7-6), securing the head prism actuating rack to the quadruple screw follower.

d. The assembled inner tube sections of the periscope are now ready for the procedure of collimation.

 
U. FINAL COLLIMATION
 
7U1. Collimation of upper and lower telescope system in high power. 1. Check the height of the Sperry-Kollmorgen collimator by using the boresight and grooved crossline disks having a diameter of 6.875 inches in similar manner to that shown in Figure 4-72, for the assembled inner tube section offset optical axis. It is 0.125 inch higher than its mechanical axis. Refer to the procedure described under Section 4V10 for the setting of the azimuth disk plate (6, Figure 4-69) to 90 degrees.

2. Loosen the wedge lock bolt (11) and wedge lock (10) sufficiently to swing the index line of the collimator base plate (7) into coincidence with, the 0 degree numeral graduation on the azimuth disk plate (6). Secure the wedge lock (10) with the wedge lock bolt (11). Check the collimator reticle. It should be located at the infinity setting (Figure 4-71),

3. Place the inner tube sections assembled in the V-blocks of the collimated optical I-beam bench, or adjustable optical benches of a tender, in a horizontal position. The head prism should be placed at 0 degree line of sight and centered in the field of the collimator.

  4. Rotate the inner tube in the V-blocks to a position for vertical collimation, with the eyepiece end of the periscope facing upward.

5. Remove the eyepiece lens mount (78, Figure 7-11) with the assembled eyepiece lens (33), eyepiece lens clamp ring (15), and its lockscrew (70) by unscrewing the eyepiece dens mount from the eyepiece prism front retaining plate (22).

6. Place the threaded periphery of the eyepiece alignment jig (Figure 4-50) in the internal threaded section in the eyepiece prism front retaining plate (22, Figure 7-11) of the eyepiece skeleton assembly. Screw the jig into the retaining plate until the shoulder of the jig is a metal-to-metal contact with the shoulder of the retaining plate.

7. The parallel position of the outer face of the alignment jig is determined with the use of a dial indicator attached to a surface gage.

8. The surface gage is used on the face of the I-beam bench, with the dial indicator set with sufficient tension on the outer face of the alignment jig.

 
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9. Keep a firm pressure on the base of the surface gage while checking each side of the outer face of the alignment jig, (Figures 4-58 and 4-59).

10. Rotate the inner tube on the V-blocks until both outer faces opposite the bored hole in the jig indicate equal height, as determined by the dial indicator pointer. This places the centerline of the emerging rays of light in the vertical direction and the light rays enter the head prism in the same direction.

11. Secure the V-block clamps by turning the adjusting knobs of the clamp brackets (Figures 4-58 and 4-59). Check the face of the alignment jig again to detect any variation and make corrections in the same manner as before.

12. When the eyepiece alignment jig is in a true parallel plane and well clamped, collimation of the instrument commences.

13. Remove the eyepiece alignment jig and replace the assembled eyepiece lens mount which was removed in Step 5, by screwing it into the eyepiece prism front retaining plate (22, Figure 7-11). Check the inner surface of the eyepiece lens and eyepiece prism front surface for cleanliness before reassembly of the eyepiece lens mount (78) in the eyepiece prism front retaining plate.

14. The position of the lower objective lens mount (5, Figure 7-10) a the third inner tube section (1) and the upper objective lens mount (82, Figure 7-6) in the seventh inner tube section (79) should remain in their original factory settings Mess a lens is replaced because of damage. A renewal of any one or both lenses requires a resetting of the lockscrew holes of both mounts in their respective inner tube sections.

15. The telemeter lens of the upper telescope system is used as a target for collimation of the lower telescope system.

16. To determine the correct position of the lower objective lens, the mechanical eyepiece prism travel of 0.920 inch or 23.85 mm is adjusted to allow a variance of travel for plus or minus to arrive at 0 diopter reading at atmospheric pressure.

  17. The mechanical travel is measured by the assembled counterweight halves (37 and 39, Figure 7-11) from its upper and lower positions. The zero diopter reading at atmospheric pressure is determined by a measurement of 0.571-inch distance between the lower stop of the assembled counterweight and the lower face of counterweight for minus diopters. The remaining distance from the upper face of the counterweight to its upper stop screw heads should measure 0.349 inch for plus diopters. The zero diopter reading at atmospheric pressure is now compensated at 1.25 mm minus for the introduction of gas.

18. Set the assembled upper objective lens mount (82, Figure 7-6), 1/4-inch from the lower end of its travel temporarily. The assembled lower objective lens mount (5, Figure 7-10) is now moved axially until sharp definition is detected on the telemeter lens. Secure the lower objective lens mount with four lockscrews (9) after obtaining sharp definition on the telemeter lens.

19. The collimation of the lower telescope system is accomplished by the axial movement of the upper objective lens mount. This brings the eyepiece prism mount arrangement into focus with the telemeter lens within the prescribed limits of -3 and +1 1/2 diopters.

20. In checking the essential travel of the assembled eyepiece prism mount (18, Figure 7-11) which should be 25 mm, diopter lenses are used. Minus and plus lenses must be inserted in the auxiliary telescope adapter (Figure 4-57) to obtain the minus and plus diopter settings.

21. Insert a -1 1/2 diopter lens in the auxiliary telescope adapter, owing the counterweight up to its stop for full travel; the stop is the opposite screw heads of two lockscrews (40, Figure 7-11) in the small flange of the eyepiece skeleton. This causes the eyepiece prism mount to move downward. Check the definition of the telemeter lens to ascertain that it will fade slightly at the end of the prism travel. It is necessary to move the upper objective lens axially to make this definition check.

22. Insert the +3 diopter lens in the auxiliary telescope adapter, and bring the counterweight to its lower stop. The two lockscrews (40)

 
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opposite each other 180 degrees in the large flange of the eyepiece skeleton have washers below their heads, and are the same size as the screws used to secure the eyepiece box to the eyepiece skeleton. The downward movement of the counterweight carries the assembled eyepiece prism mount to its upward position. Check the definition of the telemeter lens to be sure that it will fade slightly at the end of the prism travel. It may be necessary to move the upper objective lens axially to make this definition check also.

23. Continue the procedure of Steps 21 and 22 until a slight overtravel is observed at both -3 and +1 1/2 diopters.

24. Upon completion of the collimation of the lower telescope system, secure the upper objective lens mount (82, Figure 7-6) to the seventh inner tube section (79) with four lockscrews (86).

25. Move the assembled upper eyepiece lens mount axially until a clear, well-defined image is apparent. The upper eyepiece lens mount is not secured until the completion of the orientation of the telemeter lens and collimation for parallax elimination on the distance target of the collimator reticle set to 4800 feet.

7U2. Orientation of the telemeter lens. The telemeter lens is oriented in the following manner:

1. Loosen the wedge lock bolt (11, Figure 4-69) and the wedge lock (10) sufficiently to allow the Sperry-Kollmorgen collimator; base plate (7) to swing through, azimuth for an elevation of 45 degrees and depression of 10 degrees.

2. Check the position of the in tier tube sections in the V-blocks to ascertain that the head prism is spotted centrally oven the collimator axis.

3. Check the Galilean telescope system to ascertain that the instrument is in high power.

4. The telemeter lens line is oriented or squared to the vertical crossline of the collimator reticle.

5. Loosen the angular alignment screw (35, Figure 7-6) to allow free angular movement of the telemeter lens mount (31).

6. Rotate the telemeter lens mount, tapping the angular alignment screw (35) lightly while

  observing the orientation procedure. The repairman should direct his helper for the amount of angular movement required until the telemeter lens line is parallel with the vertical crossline of the collimator reticle. Secure the telemeter lens mount (31) temporarily with the angular alignment screw (35).

7. Check the parallelism of the telemeter lens line with the vertical crossline of the collimator reticle after temporary securement and make any corrections that are necessary.

8. Elevate and depress the head prism and Sperry-Kollmorgen collimator through azimuth for an elevation of 45 degrees and depression of 10 degrees. Check the parallelism of the telemeter lens line with the vertical crossline of the collimator reticle in the above degrees of azimuth. It should remain properly oriented.

9. Recheck the telemeter lens line after securing, to detect any change which may have taken place during the securement of the two telemeter lens mount lockscrews (38).

7U3. Collimation of the high power system free of parallax on the Kollmorgen distance collimator function at atmospheric pressure. This operation is carried out in the following manner:

1. Check the Sperry-Kollmorgen collimator index line on its base plate (7, Figure 4-69) to ascertain that it is in coincidence with the 0 degrees graduation of the azimuth disk plate (6). Secure the wedge lock (10) with the wedge lock bolt (11).

2. Release the lock ring (51) and turn the reticle lens mount actuating sleeve (53) clockwise six graduations as indicated by the micrometer graduation and the micrometer vernier arm (57), securing the lock ring (51) snugly against the reticle lens mount end bushing (52). This places the reticle lens (60) and its mount (42) at the 4800-foot distance target position. Figure 7-28 shows the correct position of the reticle lens mount actuating sleeve in relation to the micrometer vernier arm and the range table in Section 4V8, under the first function for the proper position of the reticle lens at this 4800-foot distance.

3. Place the auxiliary telescope at the eyepiece lens of the periscope. Set the diopter reading of

 
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the auxiliary telescope at infinity for the observer. Focus the periscope to zero setting at atmospheric pressure or minus 1/4 diopter.

4. The upper eyepiece lens mount (18, Figure 7-6) is moved axially upward approximately 0.3 mm until the image of the collimator reticle is apparent on the telemeter lens. The upper eyepiece lens mount focuses the upper eyepiece lens (2) on the collimator reticle.

5. At this setting, the auxiliary telescope is focused from plus diopter to the observer's diopter reading, to-make sure that the telemeter lens and the collimator reticle are in sharp definition. At this reading no parallax should be apparent on the telemeter lens.

6. Secure the upper eyepiece lens mount (18) with the axial alignment screw (9) and two lockscrews (11).

7. Check the procedure of Step 5, after securing the upper eyepiece lens mount, to detect any apparent change which may have taken place.

7U4. Collimation of the Galilean telescope system to the high power system, and free of parallax on the Kollmorgen distance collimator function at atmospheric pressure. This operation is performed in the following manner:

1. Follow the procedure described under Steps 1 and 3 of Section 7U3.

2. Using the 4800-foot distance target setting of the collimator, move the Galilean eyepiece lens mount (7, Figure 7-5) in the internal threads in the housing (6) until the image of the target is apparent on the telemeter lens. At this setting the auxiliary telescope is focused from plus diopter to the observer's diopter leading to check that the telemeter lens and the collimator, reticle are in sharp definition. At this reading no parallax should be apparent on the telemeter lens. Secure the Galilean eyepiece lens mount (7) temporarily with the lockscrew (50).

3. The Galilean telescope system lenses operate through 90 degrees for change of power and, therefore, must be collimated to the fixed high power magnification series of telescope systems.

  Figure 7-28. Collimator reticle lens set at 4800-foot
target distance.
Figure 7-28. Collimator reticle lens set at 4800-foot target distance.

4. The Galilean eyepiece lens mount housing (6) is provided with two elongated holes to permit adjustment and to correct its mechanical axis by means of an optical axis movement of the Galilean eyepiece lens (2).

5. Loosen the three lockscrews (9) sufficiently to adjust the. Galilean eyepiece lens mount housing (6). The optical axis of the Galilean telescope system is collimated to the optical axis of the high power system with a minimum of vertical and horizontal displacement tolerance allowance.

6. The horizontal displacement of the collimator reticle crossline image of low power is collimated to superimpose with the telemeter lens line of high power to within a tolerance of 2 minutes of arc. The collimator reticle crossline is superimposed with the telemeter lens line in high power; therefore, the change of power is necessary for determining the proper relationship of the low power system with the securement of the three lockscrews (9) each time.

7. The vertical displacement of the centerline of sight of low power is collimated to superimpose with the centerline of sight of high power within a tolerance of 30 minutes of arc. Use the horizontal crossline of the collimator reticle as a reference for the change of power to determine the proper relationship of the low power system with the securement of the three lockscrews (9) each time.

8. After the periscope has been used extensively, the V-grooves in the right side faces of the Galilean eyepiece lens and the objective lens cubes may become worn. The hardened

 
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Figure 7-29. Collimator reticle lens set at 62-foot
target distance.
Figure 7-29. Collimator reticle lens set at 62-foot target distance.

pawls, working in the V-grooves, cause the edges of the V-grooves to become rounded. This excessive wear will cause a decided displacement of a horizontal target as well as a pronounced general aberration.

9. Follow the procedure described under Section 4F3, Step 25, for checking the Galilean eyepiece lens and objective lens cubes (4 and 5).

10. Release the lock ring (51, Figure 4-69), and turn the reticle lens mount actuating sleeve (53) clockwise from infinity 14 complete turns and 25 graduations, as indicated by the micrometer

  0 degrees graduation of the actuating sleeve (53) and the micrometer vernier arm (57). Secure the lock ring (51) snugly against the reticle lens mount end bushing (52). This places the reticle lens (60) and its mount (42) at the 62-foot distance target position. Figure 7-29 shows the correct position of the reticle lens mount actuating sleeve in relation to the micrometer vernier arm and the range table in Section 4V8 under the first function for the proper relation of the reticle lens at this 62-foot distance.

11. Loosen the lockscrew (50, Figure 7-5) and focus the Galilean eyepiece lens mount (7) in the internal threads in the Galilean eyepiece lens mount housing (6), screwing out the mount with the Galilean eyepiece lens (2) until the image of the collimator reticle is apparent on the telemeter lens.

12. At this setting, the auxiliary telescope is focused from plus diopter to the observer's diopter reading, as a check that the telemeter lens and the collimator reticle are in sharp definition. At this reading, no parallax should be apparent on the telemeter lens.

13. Secure the Galilean eyepiece lens mount (7) with its lockscrew (50).

 
V. FINAL ASSEMBLIES AND CHECKING
 
7V1. Soldering precautions of antenna array and waveguide. In the silver-soldered butt joint between the waveguide attached to the antenna array and the long length extending to the bottom plug assembly, the following precautionary measures are recommended:

1. Singe the important surface to be kept clean and free from gobs of solder is the inside surface of the tubing, this surface, should be coated with powdered whiting or powdered chalk before starting the soldering operation.

2. The contact surfaces should be smooth and clean before soldering.

3. A major consideration is the avoiding of any deformity or warping in the tubing, and for this reason it is advisable to localize the heat to as small a length of the tubing as possible, but at the same time heating the joint uniformly. It is also desirable to make the soldering operation as brief as possible, so that a

  larger torch than would ordinarily be used for material of this size should be selected in order to obtain an intense localized heat.

4. Experience has indicated that the warping problem presented by the silver-soldering of the thin-walled waveguide is one which can be coped with only through practice. In view of the high tolerance (+-.005 inch) which must be maintained on the original shape and the inside dimensions of the tubing, it is recommended that short pieces of waveguide be used for experimental joints until confidence is obtained in the ability to maintain the shape and dimensions of the tubing, and in the ability to produce a neat joint on the inside of the waveguide, free from gobs of solder or other discontinuity.

7V2. Cleaning and assembly of waveguide and reassembly of power shifting tapes. a. Cleaning of antenna array and waveguide. 1. Place the antenna array and waveguide on two supports, allowing both ends to be raised, while

 
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the center will sag to the deck about 4 feet. The perforated section of the antenna array is placed upward.

2. Attach the funnel spout (Figure 7-30) in the lower end of the waveguide.

3. Fill the waveguide with approximately 1 gallon of carbon tetrachloride.

4. Lower the antenna array end over a deep pan and at the same time raise the lower end of the waveguide as high as possible.

5. Rotate the antenna array and waveguide 180 degrees while in the raised position, allowing the carbon tetrachloride to be drained into the deep pan.

  6. Attach the air hose adapter (Figure 7-31) sliding it over the antenna array and securing it in place with an additional clip at its lower end.

7. Attach the air hose to the cylindrical air line projections of the air hose adapter alternately and blow out the carbon tetra chloride until the antenna array and waveguide are dry.

8. Precaution: The fumes of carbon tetrachloride are dangerous to personnel and the flushing with this chemical must be done in the open air.

9. Filter the carbon tetrachloride and carry out the above procedure twice.

Figure 7-30. Waveguide funnel.
Figure 7-30. Waveguide funnel.
 
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10. After flushing the antenna array and waveguide with carbon tetrachloride twice, it should be flushed with alcohol and blown out with air in similar manner. (Use clear alcohol.)

11. When the antenna array and waveguide are dry, the perforated sections of the antenna array and the lower end of the waveguide are sealed off with masking tape, thus preventing the entrance of foreign matter.

b. Reassembly of waveguide. 1. Place the waveguide clamp plate (71, Figure 7-6) with its inserted dowel pins (72) in the waveguide clamp bracket (73) located on the lower part of the eighth inner tube section (60).

2. Place the two waveguide clamp plates (10, Figure 7-7) with their inserted dowel pins (11) in their respective waveguide clamp brackets (12) located on the upper and lower parts of the sixth inner tube section (1).

3. Place the two waveguide clamp plates (28) with their inserted dowel pins (29) in their respective waveguide clamp brackets (30) located

  on the upper and lower parts of the fifth inner tube section (19).

4. Place the two waveguide clamp plates (47) with their inserted dowel pins (48) in their respective waveguide clamp brackets (49) located on the upper and lower parts of the fourth inner tube section (37).

5. Place the waveguide clamp plate (23, Figure, 7-10) with its inserted dowel pins (24) on its waveguide clamp bracket (25) located on the upper part of the second inner tube section (14).

6. Reassemble the antenna array and waveguide to their respective rectangular slotted sections in the reduced tube and the inner tube sections and coupling flanges, also the flanges in the eyepiece skeleton.

7. Line up the holes of the antenna array end plate bracket (64, Figure 7-5) with the tapped holes in the skeleton head. Insert the two lockscrews (49) into the lined up holes in the end plate bracket and screw them into the tapped holes in the skeleton head.

Figure 7-31. Air hose adapter for antenna array.
Figure 7-31. Air hose adapter for antenna array.
 
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8. Reassemble the antenna array taper section bracket (66) over the taper section at the lower part of the skeleton head. Insert and secure the two lockscrews (54) after lining up the clearance holes in the bracket with the tapped holes in the skeleton head.

9. Press the waveguide down into the rectangular slotted sections of each reduced tube and inner tube sections and coupling flanges. Maintain a tension on each waveguide clamp plate against the waveguide by tightening each set of waveguide clamp plate adjustment screws and maintaining the tension by securing the waveguide clamp plate adjusting screw locknuts. The waveguide clamp plates force the waveguide against the left side of the rectangular slotted section. The tension maintained should be sufficient to secure the waveguide without placing any undue strain on its material, thus preventing any change in its internal dimensions.

10. Refer to Steps 1 to 5, inclusive, of this section for the securement of the eight waveguide clamp plates.

11. Insert a 3/8-inch straight dowel in the reamed hole section of the centering screw opening in the base of the eyepiece skeleton (42, Figure 7-11) with a sufficient portion projecting outward for a measurement check of the waveguide position.

12. The inner side of the waveguide should measure 2 5/32 inch to the 3/8-inch straight dowel so that the waveguide is properly centered for its entry in the rectangular broached hole in the bottom plug assembly.

13. The lower ends of the waveguide should be located 32 mm upward from the lower face of the eyepiece box-base. This measurement allows a 0.060-inch gap at the end of the waveguide with the shoulder of the bottom plug housing, thus having the end of the waveguide at the optimum point, and still having a differential allowance of +0.020 inch.

c. Reassembly 9 power shifting wire tape. 1. Reassemble both lengths of the power shifting wire tape (35, Figure 7-11) through the various soldered tape straps of the inner tube sections. Carry the tape through the tape straps from the first inner tube section end. The phosphor-bronze

  wire extension of each shifting wire tape is carried into the axis hole in the shifting wire clamp nuts (3) and through the shifting wire spindle assemblies of the eyepiece skeleton.

2. Remove the three lockscrews (42, Figure 7-5) from the left cube shifting rack (36), removing the clamp block (26). Attach the left power shifting wire tape (35, Figure 7-11) to the left cube shifting rack. (36, Figure 7-5) and replace the clamp block (26) tape spacer (27) and lockscrews (42).

3. Remove the three lockscrews (43) from the right cube shifting rack (34) removing the clamp block (26). Attach the right power shifting wire tape (35, Figure 7-11) to the right cube shifting rack (34, Figure 7-5) tape spacer (28) and replace the clamp block (26) and lockscrews (43).

4. Pull the phosphor-bronze wire extensions of each power shifting wire tape tight and secure each wire with the shifting wire clamp nuts (3, Figure 7-11).

7V3. Eyepiece box assembly with miscellaneous external assemblies and air line sections. 1. Remove the assembled eyepiece lens mount (78, Figure 7-11), eyepiece lens (33), eyepiece lens clamp ring (15), and its lockscrews (70) by unscrewing the eyepiece lens mount from the eyepiece prism front retaining plate (22).

2. Reassembly of the eyepiece box (11, Figure 7-12) of the lower telescope system, Part II over the eyepiece skeleton assembly proceeds as follows: Reassemble the outer tube and eyepiece box rubber gasket (22) on the upper cylindrical body of the eyepiece box, against the sealing shoulder. Check the eyepiece box to ascertain the elimination of all inward projecting assemblies so that nothing restricts its assembly.

Reassemble the eyepiece box to the large shoulder flange of the eyepiece skeleton, carrying it over the eyepiece skeleton slowly and carefully. It is carried on the small shoulder section of the large shoulder flange, where two downward projecting dowel pins in the large shoulder flange of the eyepiece skeleton engage into the reamed alignment holes in the face of the eyepiece box. Secure both together by insertion of seven lockscrews (40, Figure 7-11). These lockscrews are inserted into clearance holes in

 
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the eyepiece skeleton and screwed into tapped holes in the upper face of the eyepiece box. Place the original washers below the heads of the two lockscrews directly opposite, as the washers under these lockscrew heads provide the necessary projection to serve as a counterweight stop for the minus position.

3. Reassemble the assembled eyepiece lens mount (78) into the internal threads in the eyepiece prism front retaining plate (22). Screw the eyepiece lens mount in the eyepiece prism front retaining plate until the shoulder of the lens mount is a metal-to-metal contact with the shoulder of the retaining plate.

4. Reassemble the eyepiece skeleton centering screw lead washer (2, Figure 7-12) on the shoulder of the centering screw (24), inserting the centering screw in the base of the eyepiece box. The centering screw extends into the reamed hole in the base of the eyepiece skeleton and engages in the threaded section in the eyepiece box base.

5. Place the assembled counterweight of the eyepiece skeleton assembly at the extreme upper end of its travel (the plus position).

6. Check the +1 1/2 diopter setting with the stationary reference line of the focusing knob bracket (7, Figure 4-39). The +1 1/2 diopter setting should be turned until a slight overtravel of the stationary reference line on the focusing knob bracket exists:

7. Check the reference marks of the eyepiece drive actuating shaft (4, Figure 7-14) of the eyepiece drive packing gland assembly and the reference mark of the female coupling section (3, Figure 4-39) of the focusing knob assembly for proper alignment and assemble together.

8. Place the eyepiece drive stuffing, box body rubber gasket (3 Figure 7-14) in the counterbored section, seat in the eyepiece box (11, Figure 7-12) for the eyepiece drive packing gland assembly and line up the holes of the gasket with the tapped holes in the counterbored section seat.

9. Place the eyepiece drive packing gland assembly with the assembled focusing knob assembly in the opening of the eyepiece box

  on the rubber gasket of Step 8. Align the rectangular base of the focusing knob bracket (7, Figure 4-39) with its recess face on the eyepiece box.

10. The eyepiece drive mechanism bevel gear (1, Figure 7-14) attached to the eyepiece drive actuating shaft (4) should drop into mesh correctly with the eyepiece prism shift bevel gear (41, Figure 7-11) of the eyepiece skeleton assembly.

11. Remove the focusing knob assembly (Figure 4-39) from the eyepiece drive packing gland assembly.

12. Rotate the eyepiece drive stuffing box body (8, Figure 7-14) so that its reference numerals coincide with similar reference numerals on the recess face of the eyepiece box.

13. Secure the eyepiece drive packing gland assembly by the insertion of six lockscrews (10). These lockscrews are inserted in counterbored recess clearance holes in the stuffing box body flange (8) and screwed into tapped holes in the counterbored section seat in the eyepiece box.

14. Reassemble the focusing knob assembly (Figure 4-39) checking its reference marks as indicated in Step 7 of this section and place the female coupling section (3) over the square section of the eyepiece drive actuating shaft (4, Figure 7-14).

15. The dowel pins (8, Figure 4-39) of the focusing knob bracket (7) are pushed into place and the bracket is secured to the eyepiece box with our lockscrews (10). These lockscrews are inserted in counterbored recess clearance holes in the bracket and screwed into the tapped holes in the face of the eyepiece box flat rectangular recess.

16. Rotate the focusing knob (1) and check the overtravel by the +1 1/2 and -3 diopter graduations inscribed on the diopter ring (9) with the stationary reference line on the focusing knob bracket (7) to ascertain the correct focusing travel.

17. Reassemble the rayfilter drive stuffing box body rubber gasket (3, Figure 7-13) on the rectangular recess seat in the front of the eyepiece box.

 
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18. Check the reference marks on the rayfilter drive female coupling section (1) with its corresponding reference mark on the male coupling half section (25, Figure 7-11) of the eyepiece skeleton assembly for proper alignment. Check the stamped numeral on the rayfilter drive stuffing box body (6, Figure 7-13) to see that it coincides with the stamped numeral on the eyepiece box. It may be necessary to rotate the female coupling section (1) for both corresponding reference marks. Place the rayfilter drive packing gland assembly in the bored hole and on the rubber gasket (3) in the rectangular recess seat in the eyepiece box. Remove the rayfilter drive actuating gear (9) if necessary, from the square section of the rayfilter drive actuating shaft (8) for the application of a wrench to juggle the female coupling section (1) for its proper engagement.

19. Secure the rayfilter drive packing gland assembly with four lockscrews (11). These lockscrews are inserted in counterbored recess clearance holes in the stuffing box body (6) and screwed into tapped holes in the rectangular recess seat in the eyepiece box.

20. Reassemble the left and right training handle stuffing box body rubber gaskets (3, Figures 7-15 and 7-16 respectively) over the right and left training handle stuffing box bodies (7) up to their large flange section shoulders.

21. Check the reference marks of the right training handle female coupling section (1, Figure 7-16) with its corresponding reference mark on the male coupling section in the training handle rack gear and shaft (24, Figure 7-11), for proper reassembly.

22. Reassemble the right training handle stuffing box body (7, Figure 7-16) with its assembled rubber gasket (3), in the bored hole and counterbored section seat in the right side of the eyepiece box.

23. Rotate the right training handle stuffing box body (7) until its Stamped numerals coincide with corresponding stamped numerals on the eye piece box. Line up the clearance holes in the stuffing box body with the tapped holes in the counterbored section seat and insert the six lockscrews (10).

  24. Check the reference marks of the left training handle female coupling section (1, Figure 7-15), with its corresponding reference mark on the male coupling section of the spiral bull gear shaft (45, Figure 7-11) for proper reassembly.

25. Reassemble the left training handle stuffing box body (7, Figure 7-15) with its assembled rubber gasket (3), in the bored hole and counterbored section seat in the left side of the eyepiece box.

26. Rotate the left training handle stuffing box body (7) until its stamped numerals coincide with corresponding stamped numerals on the eyepiece box. Line up the clearance holes of the stuffing box body with the tapped holes in the counterbored section seat in the eyepiece box and insert the six lockscrews (10).

27. Check the face of the eyepiece lens (33, Figure 7-11) for cleanliness before reassembly of the eyepiece window assembly (Figure 4-38).

28. Check the cleanliness of the inner face of the eyepiece window assembly. Assemble the eyepiece window frame rubber gasket (8) to its counterbored section seat in the front of the eyepiece box. Line up the holes of the gasket with the tapped holes in the counterbored section seat.

29. Reassemble the eyepiece window assembly on the rubber gasket of Step 28, and check the reference numerals on the eyepiece window frame (7) and the eyepiece box for proper assembly.

30. Secure the eyepiece window frame (7) with four short and eight long lockscrews (2 and 3). These lockscrews are inserted in counterbored clearance holes in the frame and screwed into tapped holes in the counterbored section seat in the front of the eyepiece box.

31. Remove the masking tape from the lower end of the waveguide section continuation, and check the distance measurement of 32 mm from the lower end of the waveguide to the bottom face of the eyepiece box base for the optimum point of the waveguide and the bottom plug assembly.

32. Reassemble the bottom plug housing rubber gasket (3, Figure 7-17) over the medium

 
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Range section of the bottom plug housing (1) up to its large flange section shoulder. Line up the holes of the rubber gasket with clearance holes in the bottom plug housing large flange section shoulder.

33. Check the position of the rectangular slot in the bottom plug housing for proper alignment over the lower end of the waveguide. Reassemble the bottom plug assembly with its rubber gasket over the end of the waveguide and into the bored hole on the counterbored section seat in the base of the eyepiece box.

34. Secure the bottom plug assembly by the insertion of 12 lockscrews (7). These lockscrews are inserted in counterbored recess clearance holes in the bottom plug housing (1) and screwed into tapped holes in the counterbored section seat in the base of the eyepiece box. The lower face of the bottom plug housing extends into the counterbored section a short distance below the base of the eyepiece box, thus allowing the eyepiece box bottom flange plate (13, Figure 7-12) to contact the base of the eyepiece box.

35. Reassemble the left and right training handle assemblies (Figure 7-21 and 7-22) to the left and right sides of the eyepiece box. Check reference marks of each inner bevel gear clutch (3) with the corresponding reference marks on each square section of the right and left training handle packing gland actuating shafts (23 and 16, Figures 7-21 and 7-22 respectively).

36. Secure each hinge bracket of the left and right training handle assemblies with four bolts (5) each. The hinge bracket bolts are inserted in clearance holes in the hinge brackets (23 and 16, Figures 7-21 and 7-22 respectively) and screwed into tapped holes in the left and right sides of the eyepiece box.

7V4. Reassembly of air line sections to the reduced tube and inner tube sections. This procedure is performed in the following manner:

1. Reassemble the lower air line section (34, Figure 7-7) and its continuations (53, 13, 29, and 39, Figure 7-10) with the soldered air line couplings (40) to the connection point located at the lower part of the fifth inner tube section (19, Figure 7-7). Slide this air line section downward

  through four soldered air line straps (52) of the fourth inner tube section (37), the clearance holes in its lower end coupling (40), the clearance holes in the bearing flanges in the third inner tube section (1, Figure 7-10), and one soldered air line strap (30) of the second inner tube section (14). This air line section slides further through clearance holes in the reducing coupling (18), first inner tube section flanges (31), and the eyepiece skeleton flanges (42, Figure 7-11).

2. Reassemble the center air line section (16, Figure 7-7), with its soldered coupling (17) at its upper end and its air line continuation (34) with its soldered air line coupling (35) at its lower end, to the connection point located at the lower part of the fifth inner tube section (19). This air line section and its continuation slides upward through three soldered air line straps (33) of the fifth inner tube section (19), the clearance hole in the fourth inner tube section upper end coupling (40), and three soldered air line straps (15) of the sixth inner tube section (1). Connect the upper part of the lower air line section (34) to the soldered coupling (35) at the lower end of the center air line section continuations (34).

3. Reassemble the upper air line section (19, Figure 7-6) and its continuations (27, 41, 50, 59, 77, 90) and (16, Figure 7-7), to the connection point located at the upper part of the sixth inner tube section (1). Slide the upper air line section upward through one soldered air line strap (15) of the sixth inner tube section, the clearance holes in the bearing flanges of the seventh inner tube section (79, Figure 7-6), two soldered air line straps (76) of the eighth inner tube section (60), and the clearance holes in the flanges of the first, second, third, fourth, and fifth reduced tube sections and into the skeleton head (10, Figure 7-5). Connect the lower end of the upper air line section continuation (16, Figure 7-7) to the soldered air line coupling (17) at the upper end of the center air line section (16). It will be necessary to pull the upper air line section outward from the first reduced tube section (51, Figure 7-6) to connect the coupling in the lower end of the air line section continuation.

7V5. Orientation check of head prism travel. This procedure is performed in the following manner

 
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1. The head prism is allowed 46 degrees elevation and 11 degree depression, thus leaving a 1 degrees tolerance at the limits of travel for correction by the adjustment screws.

2. Rotate the revolving grip (26, Figure 7-21) to carry the index ring (31) with its graduated line of 45 degrees to the elevated position. Swing the Sperry-Kollmorgen collimator index line to the 45 degrees graduation as indicated by the azimuth disk plate and check the graduated line of the index ring for coincidence with the stationary line on the fixed grip (24). An overtravel of the index ring, checked with the line of sight of a slight overtravel, should be compensated by screwing out the segment adjusting screw (20) and maintaining the adjustment with the segment adjusting screw lockscrew (18).

3. Rotate the revolving grip (26) to carry the index ring (31) with its graduated line of 10 degrees to the full depression position. Swing the Sperry-Kollmorgen collimator index line to the 10 degrees graduation as indicated by the azimuth disk plate, and check the graduated line of the index ring for coincidence with the stationary line on the fixed grip (24). An overtravel of the index ring, checked with the line of sight of a slight overtravel, should be compensated by screwing out, the opposite segment adjusting screw (20) and maintaining the adjustment with the segment adjusting screw lockscrew (18).

4. Swing the Sperry-Kollmorgen collimator to zero line of sight and rotate the revolving grip (26) elevating the head prism, to check the center line of sight with the horizontal line of the collimator reticle.

5. The zero degree groove in the revolving grip inner shoulder (26) is made at the factory in the following manner. The detent plunger release knob is now rotated to the IN position, and a rawhide hammer is used to tap the detent plunger retaining bushing (10). The tapping on the bushing causes the detent plunger to make an impression on the inner bearing shoulder of the revolving grip. The V-slot is now cut on the inner bearing shoulder by following the disassembly procedure of Steps 11 and 12 of Section 7Q2.

6. The prism tilt mechanism should elevate and depress the line of sight of the periscope

  without change in azimuth of more than 10 minutes of arc between an elevation of 10 degrees and a depression of 10 degrees of the line of sight.

7. Check the movement of the revolving grip (19, Figure 7-22) of the right training handle assembly. Correct the insufficient or excessive travel of the power index ring index lines by means of the two segment adjusting screws (13). The front adjusting screw corrects for low power, while the rear adjusting screw corrects for high power.

8. Make the correct adjustment of the low power index line on the power index ring (30) with the stationary index line on the fixed grip (17) by shifting to low and then to high power. With an ear to the periscope, note the positive engagement click of the change-of-power mechanism in the skeleton head. The adjustment should be made so that the adjusting screw has sufficient clearance to allow the index line on the power index ring (30) carried by the revolving grip (19) to come into coincidence with the stationary index line on the fixed grip (17). The coincidence of these index lines should occur immediately after the change-of-power click is heard. This clearance should carry the adjusting screw (13) against the revolving grip segment stop screw (24) located in the fixed grip (17) after the positive engagement click is heard. The high-power adjustment is produced in similar manner. Any necessary adjustments to the adjusting screws (13) for the low- and high-power index lines require the disassembly of the two revolving grip locknuts (23) and the removal of the revolving grip (19).

9. While making the change-of-power adjustment, it may be found that there is not a positive engagement at high and low power. Correct this by means of the shifting wire spindle adjusting nuts (4, Figure 7-11).

7V6. Reassembly of inner tube in the outer tube. 1. Check the head prism and the Galilean eyepiece and objective lenses for cleanliness. Clean all lenses and the head prism surfaces with clean lens tissue. Remove surface dust with a clean camel's-hair brush or vacuum brush used with ether.

2. Check the left training handle, setting it to zero line of sight.

 
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3. Place the outer tube in the V-blocks on the optical I-beam bench, properly located for the assembly of the inner tube sections.

4. Place the special outer tube alignment guide (Figure 4-7) on the outer tube over the undercut section. Secure it temporarily by the use of a socket wrench so that the reference line of the guide is lined up with the front vertical azimuth line on the outer tube. Place the eyepiece box alignment guide (Figure 4-7) over the two side flat sections of the eyepiece box, resting it on its flat front section. Assemble the eyepiece box radius clamp from the rear side of the eyepiece box and insert two wing bolts into the tapped holes in the two projections of the eyepiece box alignment guide. The purpose of this outer tube and eyepiece box alignment guide is to insure correct entry and guidance for the assembly of the inserted key (17, Figure 7-12) of the eyepiece box with the inside keyway in the lower end of the outer tube (2, Figure 7-2).

5. Place the main coupling (12) on the lower end of the outer tube threads and give it a full turn.

6. Assemble the special hinged clamp (Figure 4-12) over the outer circumference of the second eccentric bearing flange of the third inner tube section (1, Figure 7-10).

7. Attach a special steel lifting plate (Figure 4-9) to the base of the eyepiece box insert the four special bolt's into the clearance holes in the lifting plate and screw them into the tapped holes in the base of the eyepiece box.

8. Connect a lifting spreader bar (similar to Figure 4-13, but shorter in length) to the hinged clamp lifting projection. Thus projection slides between the center slot section of the upper part of the spreader bar and a bolt is placed through the clearance holes in the projection and the spreader bar. The lifting plate projection slides into the center slot section of e spreader bar at the lower part and is held in similar manner to the upper part. Place the hook of the chain hoist in the center pad of the spreader bar (Figure 4-11).

9. Take a light strain with the chain hoist in the center pad of the spreader bar.

  10. Assemble the special hinged clamp over the outer circumference of the third eccentric bearing flange of the seventh inner tube section (79, Figure 7-6).

11. Attach a shackle to the hinged clamp projection on the seventh inner tube section. Place the hook of the chain hoist in the shackle and take up any slack in the chain (as shown in Figure 4-14).

12. Lift the assembled inner tube sections with both chain hoists and transport them to the lower end of the outer tube. Center the skeleton head in the outer tube, and check the lower end of the inner tube sections to make sure that they are parallel with the outer tube. Check the skeleton head lenses and head prism for cleanliness.

13. The skeleton head, reduced and inner tube sections are slowly carried in the outer tube, guiding them parallel and properly centered in the outer tube.

14. When the first and second eccentric bearing flanges of the seventh inner tube section (79, Figure 7-6) have entered the attached main coupling, the movement of the inner tube sections is halted temporarily.

15. Remove the hook of the chain hoist and special hinged clamp from the seventh inner tube section.

16. Slowly resume the movement of the inner tube sections in the outer tube, until the first eccentric bearing flange of the third inner tube section (1, Figure 7-10) has entered the attached main coupling. The movement of the inner tube sections is again halted. Place the roller stand under the eyepiece box (Figure 4-11) adjusting it until the rollers touch the eyepiece box, and release the load of the chain hoist to the roller stand.

17. Remove the spreader bar and hinged clamp and attach a shackle to the lifting plate projection. Insert the hook of the chain hoist into the shackle (Figure 4-10), and remove the strain of the overhanging inner tube sections and the eyepiece box from the roller stand.

18. Slowly resume the movement of the inner tube sections in the outer tube, until the projecting arm of the outer tube guide and the

 
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projecting arm of the eyepiece box alignment guide are near contact (Figure 4-8). Check to see that both their projecting arms will come into contact, and that they remain so for the remainder of the assembly of the inner tube sections in the outer tube, resuming the movement slowly.

19. When the upper part of the eyepiece box comes into coincidence with the attached main coupling, unscrew the coupling from the outer tube and slide it on the upper part of the eyepiece box against its threaded periphery and continue the movement slowly. Check the position of the outer tube and the eyepiece box to ascertain that the inserted key (17, Figure 7-12) and the outer tube inside keyway will come into proper engagement.

20. When the main coupling comes in contact with the outer tube, continue the movement slowly until the coupling can be turned clockwise.

21. Use a spanner wrench, insert its tooth prongs in the twin holes in the main coupling (22) and turn it clockwise. Before turning the main coupling, scribe a reference line from each lockscrew hole to the outer edge of the coupling and make a similar reference line on the outer tube for the spotted recesses. Thus a reference line is established to enable the repairman to obtain a visual determination as to when the main coupling reference line and the outer tube reference line are in coincidence for proper insertion of lockscrews (21). Thus coincidence of both tapped lockscrew holes in the main coupling with the spotted recesses in the outer tube is easily determined. The lockscrews, when inserted, should not project beyond the periphery of the main coupling.

22. Remove the hook of the chain hoist from the shackle, and remove the special bolts and the lifting plate.

23. Remove the left and right training handle hinge bracket bolts (5, Figures 7-21 and 7-22) removing the left and right training handle assemblies from the eyepiece box.

24. Remove the four lockscrews (10, Figure 4-39) from the focusing knob assembly, removing the focusing knob assembly from the eyepiece box.

  25. Remove the eyepiece box and outer tube alignment guides from the eyepiece box and outer tube.

26. Locate the periscope in the V-blocks on the optical I-beam bench to check the telemeter lens line in high power. It will first be necessary to follow the procedure of Section 4V10 for alignment of the Sperry-Kollmorgen collimator to the optical I-beam bench for the axis of the outer tube, which is 0.125 inch higher than the axes of the Types II and III periscopes. Center the head prism in the axis of the collimator. The collimator is set at infinity (Figure 4-71) and the collimator base plate index line (7, Figure 4-69) is in coincidence with the 0 degree graduation on the azimuth disk plate (6). Shift the Galilean telescope system to the IN position and check the vertical and horizontal displacement of the line of sight.

27. Should the horizontal and vertical displacement of the line of sight indicate that it is out of collimation, it will be necessary to make the adjustments as indicated in Steps 6 and 7 in Section 7U4. It is necessary to remove the inner tube sections to make this adjustment.

28. Reassemble the eyepiece box pressure gage assembly rubber gasket (1, Figure 7-12), in the rectangular recess seat in the right side of the eyepiece box. Reassemble the pressure gage assembly (10) on the rubber gasket (1) and secure it with 10 lockscrews (18). These lockscrews are inserted into countersunk clearance holes in the pressure gage assembly and screwed into tapped holes in the rectangular recess seat in the eyepiece box.

7V7. Pressure testing and cycling. The periscope is pressure tested and cycled in the following manner:

1. Follow the procedure of Section 4W6 and the cross references.

2. Use an air hose to blow off all water around the bottom plug assembly.

3. Attach a special bottom plug cycling cup (Figure 7-32) over the bottom plug assembly and secure it with a strongback, using two of the eyepiece box bottom flange plate bolts (16, Figure 7-12) to secure the strongback for the securement of the bottom plug cycling cup.

 
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The bolts are inserted in clearance holes in the strongback and screwed into tapped holes in the base of the eyepiece box.

4. Attach the vacuum gage rubber hose to one of the bottom plug cycling cup fittings, and the Hyvac pump rubber hose to the other fitting.

5. Apply apiezon wax around the periphery of the bottom plug cycling cup connection and around the joints of the vacuum gage and Hyvac pump hose.

6. Lower the pressure from the area of the bottom plug cycling cup with the Hyvac pump, thus boiling out all moisture in this area.

  7. A vacuum of 1 or 2 mm absolute pressure should be obtained and held for several hours.

8. Remove hose connections. Remove the two bolts (16, Figure 7-12), removing the strongback and the bottom plug cycling cup. After removal of the bolts, immediately apply masking tape to the bottom plug assembly to prevent any moisture from entering around the assembly.

7V8. Optical tests of the periscope in the tower. This procedure is performed in the following manner:

1. Secure a suitable hoisting clamp around the outer tube at least 12 inches below the joint between the outer tube and outer taper section. Line up the clamp with emery cloth placed with

Figure 7-32. Bottom plug cycling cup.
Figure 7-32. Bottom plug cycling cup.
 
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its smooth side against the outer tube. Use special steel bolts and nuts for securing the clamp halves together (Figure 2-34).

2. Secure a safety clamp above the hoisting clamp (Figure 2-34).

3. Lift the periscope with two chain hoist hooks placed in the thimble ends of the canvas covered slings wrapped once around the outer tube.

4. Transport the periscope from the V-blocks, lowering it to within 10 inches of the assembly floor for attachment of the hinge carriage (Figure 2-39).

5. Remove the toggle bolt and open the clamp cap of the hinge carriage and line the clamp cap and clamp section of the hinge carriage with emery cloth placed with its smooth side against the outer tube. Secure the clamp cap and clamp section of the hinge carriage to the outer tube with two special bolts and nuts over the emery cloth. Insert the toggle bolt in the lined up holes of the supporting arm and clearance wall periphery projection of the hinge carriage after the clamp is secured.

6. Follow the procedure described under Steps 36, 38, 39, 40, and 41 of Section 4W4, in the inverse order, for transporting the periscope to the tower.

7. Reassemble the housing yoke assembly by following the procedure described under Section 4V19.

8. Slowly lower the periscope onto the hoisting yoke cable suspension adjusting nuts. This places the load of the periscope on the hoisting yoke and cables suspended from the lower platform in the tower. Remove the two shackles and hoisting slings from the hoisting clamp.

9. Reassemble the focusing knob assembly to the eyepiece box. Align the corresponding reference marks of the female coupling section (3, Figure 4-39) and the eyepiece drive actuating shaft (4, Figure 7-14) of the eyepiece drive packing gland assembly. Secure the knob bracket (7, Figure 4-39) after proper engagement of dowel pins (8) with the four lockscrews (10).

  10. Reassemble the left and right training handle assemblies to their respective sides of the eyepiece box. Check the reference marks of the connecting couplings for proper alignment. Secure both training handle assemblies with four hinge bracket bolts each (5, Figures 7-21 and 7-22).

11. Check the zero reading of the diopter index ring (9, Figure 4-39). Place the auxiliary telescope at the eyepiece end of the periscope. Focus the eyepiece prism mount until sharp definition of the telemeter lens is apparent on an infinity target or infinity collimator.

12. Check the high- and low-power system on an infinity target or infinity collimator. No parallax should be apparent on the telemeter lens in either power.

13. Check the periscope in high and low power for cleanliness. If particles of dirt are present, they will show clearly on the telemeter lens which lies in the focal plane of the instrument, in which case it is necessary to remove the inner tube sections, and further disassemble for cleaning purposes.

14. Check the vertical and horizontal displacement of the line of sight of the Galilean telescope system in the IN and OUT positions. Use a church steeple, flagstaff, chimney or infinity collimator for checking the prescribed displacement tolerances.

15. Check the field; it must be free of fog.

16. Check the operation of the left and right training handle assemblies, noting particularly their limit of travel stops by corresponding stationary index lines.

17. After inspection, the periscope is returned to the assembly floor by first following the procedure describes under Section 7B, Steps 5, 6, and 9 for the disassembly of the left and right training handle assemblies, focusing knob assembly, and hoisting yoke assembly. Follow the procedure described under this section, Steps 1 to 6 inclusive, in the inverse order, for the return of the periscope in the V-blocks on the optical I-beam bench and the reassembly of the external projections.

18. Reassemble all external projections of Section 7B, Steps 3 to 7 inclusive, to the eyepiece box in the inverse order.

 
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19. The periscope is now ready for the electronic engineer for the prescribed electronic tests.

20. After the prescribed electronic tests of Section 7V8, the eyepiece box bottom flange plate (13, Figure 7-12) is reassembled to the base of the eyepiece box (11) and is secured with five bolts (16). The inserted rubber gasket side of the flange plate is placed next to the base of the eyepiece box.

21. Cover the opening in the eyepiece box bottom flange plate with masking tape to prevent moisture from entering the open area of the flange plate and around the bottom plug assembly.

7V9. Electronic testing procedure. (For electronic engineer only.) a. Modifications to equipment. 1. The following modifications of the TS-12/AP and TS-13/AP test sets are necessary to adapt them for testing the ST antenna assemblies:

a) Supply matched load CG-88/U without connector and so constructed that it will have a voltage standing wave ratio of 1.03 or lower at wavelengths of 3.36 cm and 3.44 cm. Engrave a line around the matched load, 0.537 inch 0.005 inch from the open end.

b) Supply standing wave machine CG-87/U with the round cover flange replaced with a choke flange AN type UG-52/U.

c) Revise the carrying case for TS-12/AP (Unit 2) to fit the modified standing wave machine.

d) The Model 53 wavemeter supplied with the TS-13/AP cannot be calibrated for the ST frequency band because several revolutions of the wavemeter dial are required to cover the entire band. Replace the Model 53 wavemeter assembly with a General Electronics Industries wavemeter Model 1510 modified in the following manner:

1) Drill and tap holes in, the wavemeter flange for mounting it on the TS-13/AP coupling flange.

2) Enlarge the wavemeter coupling hole to 19/64 inch. After enlarging the hole, the wavemeter should be disassembled by removing the

  six screws holding the micrometer head support in place. The wavemeter should be thoroughly cleaned and burrs removed from the edges of the enlarged hole. Reassemble the wavemeter with micrometer engraving 90 degrees counterclockwise from plane of mounting flange, so that readings may be taken from above when the meter is in position in the TS-13/AP. The TS-13/AP must be taken out of the case in order to read the wavemeter unless further modification can be suggested.

e) Drill a 5/8-inch hole in the panel of the TS-13/AP to accommodate the micrometer head of the wavemeter.

b. Instructions for testing ST antenna assembly and plug on submarine tenders and at advanced bases. 1. Introduction. Standing wave ratio measurements are made on the ST antenna assembly and the bottom plug alone by the TS-12/AP and TS-13/AP test sets. The TS-13/AP is a source of a square wave modulated radio-frequency signal variable in frequency. The TS-12/AP test set detects the signal with a CG-87/U standing wave machine and a linear amplifier which is provided with a meter which indicates voltage standing wave ratio directly.

2. Operation of TS-13/AP signal generator.

a) Connect the line cord to a source of 115 volts, 60-800 cycle power, and operate the POWER switch to ON.

b) Allow 3 minutes for the equipment to warm up.

c) The following switches should be in the indicated positions:

Switch Position
SYNC/SELF SYNCSYNC
CALIBRATE/USEUSE
PULSE/SQUARE WAVEPULSE
INPUT SEL.+ TRIG

d) Adjust REFLECTOR control for minimum meter deflection.

e) Vary ZERO SET control until meter reads zero.

f) Operate CALIBRATE/USE switch to CALIBRATE.

g) Vary REFLECTOR control throughout its range. Select the point which gives maximum

 
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deflection. Vary ADJUST OUTPUT control to keep meter reading on scale.

h) Throw the following switches to the indicated positions:

SwitchPosition
SYNC/SELF SYNCSYNC
CALIBRATE/USEUSE
PULSE/SQUARE WAVESQUARE WAVE

i) Measure frequency by very slowly turning FREQUENCY micrometer head while carefully watching the meter. The signal generator frequency is indicated by a sharp dip in the meter reading.

j) Tune the signal generator to the proper frequency by varying the TUNING control. Clockwise rotation of the TUNING control decreases the frequency (increases the wavelength). Adjust REFLECTOR control for maximum meter reading after each adjustment of the tuning control and before measuring the frequency.

k) Rotate the ATTENUATOR control to the maximum clockwise position.

l) The equipment is now ready for use.

c. Operation of TS-12/AP standing wave indicator-amplifier. 1. Connect the line cord to a source of 115 volts, 60-800 cycle power and operate POWER switch to ON.

2. Connect the probe cable to either input jack and throw the INPUT selector switch to the corresponding position, NO. 1 or NO. 2,

3. The METER switch, should be at AMP. and the BOL/XTAL switch in the XTAL position.

4. Adjust MASTER and appropriate INPUT gain controls for a meter reading near lull scale.

d. Procedure for standing wave ratio measurements. 1. Set up test equipment as shown in Figure 7-33.

2. To test the periscope assembly attach the square flange connector of the standing wave machine: CG-87/U to the periscope eyepiece box by means of the four tapped holes provided in the bottom plug housing clamp ring (2, Figure 7-17), being sure to dine up the waveguide opening with the corresponding dimensions of the opening in the bottom plug. Measure the

  standing wave ratio at frequencies corresponding to wavemeter readings of 355, 356, 357, 358, 359, 443, 444, 445, 446, 447.

To test the bottom plug alone, attach the square flange connector of the standing wave machine to the face of the bottom plug housing clamp ring as before. Insert the open end of the matched load CG-88/U into the other end of the bottom plug until the engraved line on the matched load is flush with the surface of the plug. If the matched load fits too tightly into the plug to allow easy insertion, the outside surfaces of the matched load may be filed down slightly where necessary, provided that the filings are entirely removed with an air hose (inside and outside) before the matched load is reused. Measure the standing wave ratio at frequencies corresponding to wavemeter readings of 355 and 447.

3. Place test equipment in operation as indicated in b and c.

4. Tune the traveling probe for maximum deflection on the meter by turning the knurled nut on the probe assembly. Do not make any other adjustment on the probe. Tune the probe every time the operating frequency is changed.

5. Run the probe along the slotted line until the meter shows maximum deflection. Adjust the INPUT gain control until the meter reads exactly 1.0 on the upper scale. Then move the probe to the point of minimum deflection and read the voltage standing wave ratio on the upper scale of the meter.

e. Performance specifications. The voltage standing wave ratio of the assembled periscope must be 1.33 or less over the entire frequency band of the antenna.

If the specified performance is not obtained on the assembled periscope, the bottom plug assembly should be removed and tested alone for its standing wave ratio. If the voltage standing wave ratio is lower than 1.26 at both frequencies the plug is satisfactory and the long length of waveguide should be recleaned, and if necessary, replaced. If the voltage standing wave ratio of the plug is equal to or higher than 1.26 at either frequency, another bottom plug assembly should be tested and, if satisfactory,

 
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Figure 7-33. Electronic diagram.
Figure 7-33. Electronic diagram.
used in place of the first bottom plug assembly in a second assembly test.

A is the component to be measured.

1. Periscope test. Attach the standing wave machine CG-87/U, to the periscope eyepiece box by means of the four tapped holes in the bottom plug housing clamp ring. (2, Figure 7-17). Be sure to line up the long dimension of

  the waveguide and the corresponding dimension of the opening in the bottom plug.

2. Bottom plug test. Attach the standing wave machine to the bottom plug assembly as before. Insert the open end of the matched load CG-88/U into the other end of the bottom plug until the engraved line on the matched load is flush with the surface of the plug.

 
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