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215
 
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223
 

INDEX

PAGE
Accuracy, Mk. VII Mod. 4 Compass 13
Adjustment 95, 101
  Ballistic Deflection 107
  Bell Crank 103
  Card 106
  Commutator Slip Ring Brush 109
  Commutator Transmitter 106
  Damping Cut-Out Contact 109
  Damping Percentage 103
  Dynamic Balance 104
  Follow-up Coil 108
  Follow-up Coil Slip Ring Brush 109
  Follow-up Relay 108
  Follow-up System 108
  Gimbal System 107
  Gyro Unit Balance 104
  Gyro Wheel Balance 104
  Levels, Sensitive Element 102
  Low Voltage Relay 108
  Pendulous Factor 102
  Repeater Cards 108
  Sensitive Element Balance 101
  Speed Corrector Mechanism 92, 106
  Synchro Brush Dead Space 106
  Transmitter 106
  Vacuum, Loss of 95
Alarm Flasher 54, 70
  Circuit 70
  Flashing of Alarm 97
  Wiring Diagram 70
Alignment of Compass 82
A.C. and D.C. Switch Parts 173
Amplifier, Follow-up Panel 47
  Circuit, Description 59, 119
  Follow-up Schematic 65
  Sensitivity Control 47
  Tube 47
  Wiring Diagram 99
Angle, Correction 10
Anti-Hunt Unit 63
  Circuit 63
  Location 47
  Wiring Diagram 65
Apparent Meridian 10
Apparent Rotation 2
Assembly of Compass 81
  Binnacle, Gimbal Rings, and Bowl 81
  Sensitive Element 81
  Spider Assembly 82
Automatic Speed Correction Mechanism 31
  Adjustment and Repair 92, 97, 106
  Care and Maintenance 90
  Circuits 71
  Hunting 97
  Inspection Check-off List 92
  Operation 85
  Parts List 127
  Range Extension Table 85
  Table for 25 Knot Automatic Speed Corrector Check 93
PAGE
Azimuth Follow-Up
  Hunting 62
  Motor Replacement 113
  Schematic 65
Azimuth Scale, Emergency 25
Balance
  Bell Crank 103
  Dynamic, Gyro Wheel 104
  Gimbal System 107
  Gyro Unit 104
  Gyro Wheel 104
  Sensitive Element 101
Balancing Weights 25
Ball, Float 25
  Replacement 116
Ballistic Adjustment 107
  Rheostat 45
Ballistic Damping Error. 7, 11
Ballistic Deflection Error 7, 11
Bearing Displacement 32
Bearings, Replacement of Gyro Unit 117
Bearings, Gyro Wheel 21
  Replacement 117
Bearings, Lubrication of All 88
Bell Crank Lever, Gyro Coupling 21
  Adjustment 103
Binnacle 17
  Alignment 82
  Disassembly 81
  Inspection 94
  Installation 81
  Parts List 153
Bowl
  Inspection 94
  Installation 81
  Parts List 153
  Suspension 19
Boxes, Connection 50
Bracket Parts 200
Brushes, Commutator Transmitter 31
Brush, Slip Ring, Adjustment 109
Bubble, Position of 87
Cables - Parts List 160
Card, Master Compass 26
  Adjustment 106
Card, Repeater Compass 49-52
Adjustment 108
Care and Maintenance 88
Casing, Evacuation of Gyro 118
Chart, Lubrication 88
Checking and Inspection of Equipment 88
Circuits, Description of 55
  Amplifier 59, 119
  Anti-Hunt 63
  Control Panel 71
  Damping Cut-Out 56
  Follow-up Coil 56
  Gyro Drive 56
 

224
 
PAGE
Circuits, Description of (Continued)
  Motor Generator 40, 56
  Relay, Repeater Overload 68
  Repeater 68
  Repeater Panel 71
  Speed Correction Mechanism 71
  Synchro Motor 67
  Transmitter 67
  Tube, Grid Control Rectifier 61
Circuits, Designation of 71
Closing Down the Compass 87
Coil, Follow-Up, See Follow-Up Coil and Support Stalk Replacement 111
Collar, Mercury Tank 25
Collector Rings, Lubrication of 88
Common Parts for A.C. and D.C. Supply and Motor Generator Switches 173
Commutator Transmitter 31, 67
  Adjustment 106
  Brushes 31
  Construction 67
  Disassembly 111
  Electrical Zero 106
  Operation 67
  Schematic 68
  Transformer 67
  Voltage Distribution 68
  Wave Shape 68
Comparison of Mk. 7 Mod. 4 and Mk. 7 Mod. 3 Equipments 13
Compartment Pressure Test 91
Compass, Master
  Accuracy 13
  Alignment 82
  Assembly, See Assembly of Compass. 81
  Card 26
  Operation 84
  Parts List 121
  Power Requirements 86
  Starting the Master Compass 84, 91
  Synchro Motor 49
  Units of 17
  Wiring 73
Compass Errors, Theory 6
Compass Head, Disassembly 113
Compass Lights, Replacement 116
Compass, Pressure-Proof Repeater 52
Compass, Repeater 49
  Bezel Ring 49
  Circuit, Description 68
  Double Dial Bearing, Mk. 2 Mod. 3. 52
  Double Dial Concentric Steering,
  Mk. 6 Mod. 0 50
  Illumination 49-52
  Inspection 94
  Parts List
  Mk. 2 Mod. 3 189
  Mk. 2 Mod. 11 191
  Mk. 6 Mod. 0 193
  Mk. 8 Mod. 1 195
PAGE
Compass, Repeater (Continued)
  Schematic 72
  Single Dial Bearing, Mk. 3 Mod. 11 49
  Single Dial Bulkhead Mounted Mk. 8
  Mod. 1 51
  Wiring Connections 72
Compass, The Gyro As A 2
Connection Boxes 50
  Parts List
  Common Parts 197
  Mk. 1 Mod. 9 199
  Mk. 1 Mod. 11 199
Contact Parts, Mercury 23
Contacts, Damping Cut-Out 33
Control Panel, Description 43, 71
  Fuses 43
  Fuses, Time Lag 44
  Inspection 94
  Parts List 167
  Power Supply 43
  Switches 43
  Wiring Diagram 75
Correction Angle, Speed Error 10
  Mechanism for Speed Correction 31
Corrector Setting, Knots 85
Coupling, Gyro 21
Cover, Binnacle 19
Critical Grid Voltage 61
Current Capacity of Fuses 44
Current, Excessive, in Gyro Unit 95
Current, Normal Values of 86
Cut-Out Contacts, Damping 33
  Lamp, Damping 43
Damping
  Adjustment
    Oil Damping 103, 109
    Spring Damps 107
  Cut-Out Circuit, Description 56
  Cut-Out Contacts 33
    Adjustment 109
  Cut-Out Lamp 43
  Cut-Out Relay 45
  Cut-Out Switch (Control Panel)
  Parts List 172
  Cut-Out Transformer 56
  Cut-Out Valve 23, 56
    Theory 11
  Error 7, 11
  Percentage 6
    Adjustments 103
  Suspension of Bowl 19
  System, Oil 23
Damps, Adjustment of Spring 107
Dead Space in Follow-Up 97, 106
Deflection, Ballistic 7, 11
Designation of Circuits 71
Diagrams, Wiring, See Wiring Diagrams
Dials, Compass 26
  Adjustment 106
  Speed Ratio of 26
 

225
 
PAGE
D.C. Resistance of Follow-Up Circuits. 99
Directive Effort 4, 9
Disassembly
  Binnacle 81
  Compass Head 113
  Oscillator Mechanism 114
Double Dial Bearing Repeater Compass 52
Double Dial Concentric Steering Repeater Compass 50
Drive, Gyro 56
Driving Mechanism 31
  Replacement 111
Dynamic Balance of Gyro Wheel 104
East-West Stabilization 9
Eccentric Bearing Mechanism 32
Effect of Rolling of Ship on Compass 7
Effort, Directive 4, 9
Electrical Values, Follow-Up Parts 98
Electrical Zero
  Commutator Transmitter 106
  Synchro Motor 106
Element, Sensitive, See Sensitive Element
Emergency Azimuth Scale 25
Equilibrium, Neutral 1
Equipment, Compass
  Comparison of Mk. 7 Mod. 4 and Mk. 7 Mod. 3 13
  Installation 81
  Operation 84
  Power Requirements 86
  Units 15
Erratic Motion, Follow-Up 97
Error
  Ballistic Deflection 7, 11
  Damping 7, 11
  Intercardinal 7
  On Turn, See Damping Error 7, 11
  Speed 7, 10
Errors in Compass
  Maximum Allowable 13
  Settling Point 96
  Theory 6
  Variable 96
Evacuation of Gyro Casing 118
Excessive Current in Gyro Circuit 95
Excessive Vibration of Gyro Unit 95
Factor, Pendulous 3
  Adjustment 102
  Theory 3
  Washers 25
Failure of Follow-Up to Operate 97
Field Coils, Follow-Up Motor, Replacement 111
Flasher, Alarm, See Alarm Flasher
Flasher Box, Mk. 1 Mod. 0 - Parts List. 157
Float Ball 25
  Replacement 116
Flotation and Oscillator Assembly Parts List 149
PAGE
Flotation, Mercury 25
Follow-Up
  Adjustment 108
  Amplifier Unit 47, 59, 119
  Circuit, Description 56
    D.C. Resistance 99
  Coil and Support Stalk 26, 56
    Adjustment 107
    Parts List 140
    Removal 114
    Replacement 111
  Coil Slip Ring Brush Adjustment 109
  Contact Tube, Removal of 114
  Dead Space 97, 106
  Excessive Sparking at Head 97
  Failure to Operate 97
  Hunting 63
  Magnet 56
    Replacement 111
    Transformer 56
  Mechanism 26
  Motion, Erratic 97
  Motor 26
    Parts List 127
    Replacement 111, 113
  Outline of Action 55
  Panel 47, 71
    Inspection 94
    Parts List 177
    Wiring Diagram 75
  Parts, Table of Electrical Values of 98
  Relay 48
    Adjustment 108
  Sensitivity of System 48
    Adjustment 108
  Speed Corrector Mechanism 85
  Troubles 98
  Wiring Diagram 57, 65, 75
Front View (Control Panel) Parts List 167
Fuses
  Control Panel 43
  Current Capacities of 44
  Repeater Panel 46
  Time Lag 44
Galvanometer, Electro-Dynamometer Type 61
Gearing, Lubrication of 88
Generator, Motor, See. Motor Generator Gimbal Rings 19
  Parts List 153
Gimbal System Adjustment 107
Grid Control Rectifier Tubes 61
  Circuit 61
Gyro and Follow-Up Circuits, Wiring Diagram 57
Gyro as a Compass 2
Gyro Case
  Lubrication 88
  Spindle 21
  Vacuum 21
 

226
 
PAGE
Gyro Coupling, Description 21
  Lubrication 88
  Parts List 147
Gyro Drive Circuit 56
Gyro, Pendulous 3
  North-Seeking Quality 3
  Period of Oscillation 3-6
Gyroscope 1
  Definition 1
  Properties 1
  Theory 1
Gyro Speed 11, 56, 108
Gyro Stop Screw 21
Gyro Units
  Balance 104
  Bearings 21
    Lubrication 88
    Removal 117
    Replacement 117
  Description 21
  Evacuation 118
  Excessive Current in 95
  Heat Run 119
  Lubrication System 21
  Parts List 145
  Reason for Two Units 9
  Removal from Sensitive Element 116
  Replacement 118
  Speed Measurement 108
  Voltages 86
  Wheel Balance 104
Head, Disassembly of Compass 113
Heat Run, Gyro Unit 119
Height, Metacentric 7
hinged Panels (Control Panel) Parts List 169
Hot Gyro Unit 95
Hunting of Azimuth Follow-Up Mechanism 62
  Elimination by Anti-Hunt 63
  Explanation 62
Hunting of Speed Corrector Follow-Up 97
Illumination, Repeater Compass 49-52
Illustrations, List of III
Input Transformer 59
Inspection and Checking of Equipment 88
Inspection Check-Off List 92
  Binnacle and Lower Bowl 94
  Motor Generators 94
  Panels
    Control 94
    Follow-Up 94
    Repeater 94
  Repeater Compasses 94
  Sensitive Element 93
  Speed Correction Mechanism 92
  Spider Assembly 92
Installation of Compass Equipments 81
  Alignment of Compass 82
PAGE
Installation of Compass Equipments (Continued)
  Binnacle, Gimbal Rings, and Bowl 81
  Quantity of Mercury
    Collector Ring Cups 82
    Flotation 81
  Sensitive Element 81
  Spider Assembly 82
Instruments
  Control Panel 43
  Follow-Up Panel 47
  Repeater Panel 46
Intercardinal Error 7
Interchangeability, North and South Gyro Units 21
Interstage Transformer 59
Lamps
  Damping Cut-Out 43
  Trouble Indicator 46, 68
Latitude
  Ballistic Adjustment for 45
  Effect on Ballistic Deflection 11
  Effect on Speed Error 10
  Leveling Device 25
Levels
  Adjustments 102
  Position of Bubble 87
  Use in Settling Element on Meridian 86, 102
Lever, Gyro Coupling Bell Crank 21
Lights, Compass, Replacement 116
Limit of Reliable Compass Operation 10
Linkage, Gyro Coupling 21
  Lubrication 88
List of Illustrations III
List of Ship's Drawings V
List, Parts 121
List, Price 201
Loss of Vacuum 95
Low Gyro Supply Voltage 97
Low Voltage Relay 45
  Adjustment 108
Lubrication Chart 88
Lubrication System, Gyro Unit 21
Magnets, Follow-Up 23, 56
  Replacement 111
Maintenance Schedule 88
Manual Speed Correction 32
Master Compass, See Compass, Master
Maximum Allowable Errors in Compass 13
Memorandum 215
Mercury
  Contact Parts 23
    Parts List 141
  Flotation 25
  Quantity of
    Collector Ring Cups 82
    Flotation 81
  Tank Collar 25
 

227
 
PAGE
Meridian
  Apparent 10
  Settling Element on 86
Metacentric Height 7
Motor
  Azimuth Follow-Up 26
    Replacement 111, 113
  Oscillator 26
  Synchro, Type 5F 49, 67
Motor Generator 40
  Circuit, Description of 56
  Construction 40
    Ceiling 40
    Deck-Mounted 40
  Electrical Values 40
  Inspection 94
  Lubrication 88
  Parts List
    Mk. 11 Mod. 1 159
    Mk. 11 Mod. 2 159
  Speed 86, 108
  Switch Parts 175
Multiplier Lead Screws, Lubrication 88
Neon Lamp Parts 177
Noisy Gyro Unit 95
Normal Values of Current 86
North Gyro used in South Position 118
North-Seeking Quality of Pendulous Gyro 3
Oil Damping System 23
Parts List 149
Oil, Gyro 89
Operation of Compass Equipment 84
Oscillation, Damped Period of 5, 6
Oscillation, Undamped Period of 3, 5
Oscillator, Mercury Tank 26
  Disassembly 114
  Lubrication 88
  Replacement 114
Overload Relay, Repeater, Circuit 68
  Schematic 69
Own Speed Input Mechanism - Parts List 133
Panel
  Control, 43, 71
    Fuses 43
    Fuses, Time Lag 44
    Inspection 94
    Power Supply 43
    Switches 43
    Wiring Diagram 75
  Follow-Up 47, 71
    Inspection 94
    Wiring Diagram 75
  Repeater 46, 71
    Fuses 46
    Inspection 94
PAGE
Panel, Repeater, Wiring Diagram 77
Parts List 121
  Bracket Parts 200
  Connection Boxes
    Common Parts 197
    Mk. 1 Mod. 9 199
    Mk. 1 Mod. 11 199
  Control Panel 167
    A.C. and D.C. Switch 173
    Common Parts for A.C. and D.C. Supply and Motor Generator Switches 173
    Damping Cut-Out Switch 172
    Front View 167
    Hinged Doors 169
    Motor Generator Switch 175
    Neon Lamp 177
    Rear View 167
    Rheostat 171
    Snap Switch 172
  Flasher Box Mk. 1 Mod. 0 157
  Follow-up Panel 177
    Pre-Amplifier 179
  Master Compass 121
    Binnacle Parts 153
    Cables 160
    Flotation and Oscillator Assembly 149
    Follow-up Coil 14C
    Follow-up Motor 127
    Gyro Coupling Assembly 147
    Gyro Unit 145
    Lower Bowl and Gimbal Rings 153
    Mercury Contact Parts 141
    Oil Damping System 149
    Own. Speed Input Mechanism 133
    Sensitive Element 143
    Speed Correction and Driving Mechanism 127
    Spider Parts 137
    Synchro Motor, Type 1F 137
    Transmitter Head Assembly 225
  Motor Generator Mk. 11 Mod. 1 159
  Motor Generator Mk. 11 Mod. 2 159
  Repeater Compass Mk. 2 Mod. 3 189
  Repeater Compass Mk. 3 Mod. 11 191
  Repeater Compass Mk. 6 Mod. O 193
  Repeater Compass Mk. 8 Mod. 1 195
  Repeater Panel Mk. 7 Mod. 0 181
  Repeater Panel Mk. 7 Mod. 1 183
  Rotary Switch 164
  Synchro Motor, Type 5F 197
Parts, Mercury Contact 23
Parts Replacement
  Amplifier Unit 119
  Coil Support, Stalk, and Contact Tube, Follow-up 114
  Compass Head 113
  Driving Mechanism, Follow-up 111
  Evacuation of Gyro Casing 118
 

228
 
PAGE
Parts Replacement (Continued)
  Float Ball 115
  Follow-Up Coil 116
  Follow-Up Magnet 111
  Follow-Up Motor 111
    Azimuth 113
    Speed 112
  Gyro Unit 116, 118
    Bearings 117
  Gyro Wheel Bearings 117
  Lights 116
  Oscillator 114
  Sensitive Element 116
  Speed Receiver Synchro 112
  Spider 112
  Transmitter 111
Pendulous Factor
  Adjustment 102
  Theory 3
  Washers 25
Pendulous Gyro 3
Percentage, Damping 6
Period of Oscillation-Damped
  Curve 6
  Damping Percentage 6
  Method of Damping 5
Period of Oscillation-Undamped
  Curve 5
  Explanation 3
Permanent Weights 25
Plane, Rigidity of 1
Position of Bubble 87
Power Requirements of Compass Equipment 86
Pre-Amplifier (Follow-Up Panel) Parts 179
Precautions, Safety 120
Precession, Rule for 2
Pressure-Proof Repeater Compass 52
Pressure Test, Compartment 91
Price List 201
Purpose, Arma Compass Equipment 13
Rear View (Control Panel) Parts List 167
Rectifier Tube, Grid Control 49, 61
  Circuit, Description 61
Refusal of Element to Settle 95
Relays
  Damping Cut-Out 45
  Follow-Up 50
    Adjustment 108
  Low Voltage 45
    Adjustment 108
  Repeater Overload 46
    Circuit 68
Reliable Compass Operation, Limit of 10
Remedies 95
Removal of Spider Assembly 112
Repair, See Adjustment
Repeater Card, Adjustment 108
Repeater Compass, See Compass, Repeater Repeater Panels 46
PAGE
Repeater Panels (Continued)
  Circuit, Description 71
  Fuses 46
  Inspection 94
  Parts List
  Mk. 7 Mod. 0 181
  Mk. 7 Mod. 1 183
  Wiring Diagram 77
Repeater Switch Wiring Diagram 79
Replacement, Parts, See Parts Replacement
Resistance, Follow-Up Circuits, D.C. 99
Rheostat, Ballistic Adjustment 45
Rheostat (Control Panel) Parts List 171
Rigidity of Plane 1
Rings, Gimbal 19
Rings, Lubrication of Collector 88
Rolling, Effect on Compass 7
Rotary Switch Parts 184
Rotation, Apparent 2
Rule for Precession 2
Safety Precautions 120
Scale, Emergency Azimuth 21, 25
Schedule, Maintenance 88
Schematics, See Wiring Diagrams
Screws, Lubrication of Multiplier Lead 88
Sensitive Element
  Adjustment 102
  Balance 101
  Description 19
  Inspection 93
  Installation 81
  Parts List 143
  Refuses to Settle 95
  Removal 116
Sensitivity, Follow-Up System 47
Settling Point, Error in 96
Ship's Drawing List V
Shutting Down the Compass 87
Slip Ring Brush, Adjustment 109
Snap Switch (Control Panel) Parts List 172
South Gyro Used in North Position 118
Space, Dead, in Follow-Up
  Azimuth 97
  Speed Corrector 106
Sparking, Excessive, at Follow-Up Head 97
Speed Correction Mechanism, Automatic,
  See Automatic Speed Correction Mechanism
Speed Correction, Manual 32
Speed Corrector Check
  Table for 25-Knot Automatic 93
  Range Table 85
Speed Error 7, 10
Speed Follow-Up Motor Replacement 112
Speed, Gyro Wheel 11, 58, 108
Speed Measurement 108
Speed, Motor Generator 86, 108
Speed Ratio of Dials 30
 

229
 
PAGE
Speed Receiver Synchro
TableFailure to Operate 97
TableReplacement 112
Spider Assembly
  Inspection 92
  Installation 82
  Parts List 137
  Removal 112
  Replacement 112
  Spider 19
Spindle, Gyro Case 21
Stabilization, East-West 9
Stand, Binnacle 19
Starting the Master Compass 84, 91
Stop Screw, Gyro 21
Support Stalk, See Follow-Up Coil and Support Stalk 26, 56
Suspension Damps, Spring 17
TableAdjustment 107
Switches
  Control Panel 43
  Repeater Panel 46
  Wiring Diagram, Repeater 79
Synchro Brush Dead Space 106
Synchro Motor 49
  Circuit and Description 67
  Electrical Zero 106
  Overload Relay 68
  Schematic 67
  Type 1F - Parts List 137
  Type 5F - Parts List 197
Synchro, Speed Receiver, See Speed Receiver Synchro
Synchronization of Speed Corrector Follow-Up 85
Table, Corrector Setting, Knots 85
Table for Speed Corrector Check 93
Tank, Mercury Flotation, and Collar 25
Test, Compartment Pressure 91
Theory 1-11
Time Lag Fuses 44
Transformer
  Damping Cut-Out 56
  Follow-Up Magnet 56
  Input 59
  Interstage 59
  Transmitter 67
Transmitter, Commutator, See Commutator Transmitter
Transmitter Head Assembly - Parts List 125
Trouble Indicator Lamps 46, 68
Troubles and Remedies 95
  Alarm Flashes 97
  Dead Space in Azimuth Follow-Up 97
  Element Refuses to Settle 95
  Error in Settling Point 96
  Error on Turn 96
  Excessive Current in Gyro Unit 95
  Excessive Vibration of Gyro Unit 95
  Follow-Up Motion Erratic 97
PAGE
Troubles and Remedies (Continued)
  Loss of Vacuum 95
  Low Gyro Supply Voltage 97
  Noisy or Hot Gyro Unit 95
  Variable Error in Compass 96
Tube, Amplifier, Type 6A6 47
Tube, Contact, Removal 114
Tube, Grid Control Rectifier, Type C6A 47, 61
Turning Error, See Damping Error 96
Undamped Period of Oscillation, See Period of Oscillation-Undamped Unit, Anti-Hunt, See Anti-Hunt Unit
Units, Gyro 21, 116
Units of Compass Equipment 15
Vacuum. Gyro Casing 21
  Loss of 95
  Renewal 118
Valve, Damping Cut-Out 23, 56
Variable Error in Compass 96
Vibration, Excessive, of Gyro Unit 95
Voltage
  Critical Grid 61
  Distribution, Commutator Transmitter 68
  Follow-Up Parts 98
  Gyro 86
  Low Gyro Supply 97
  Normal Values 86
  Relay Adjustment, Low 108
Washers, Pendulous Factor 25
Wave Shape, Transmitter 68
Weights, Balancing 25
Wheels, Lubrication of Gyro 88
Wiring Diagrams
  Alarm Flasher 70
  Amplifier, Schematic 65
  Amplifier Unit 99
  Anti-Hunt Unit 65
  Commutator Transmitter, Schematic 68
  Control Panel 75
  Follow-Up Panel 75
  Follow-Up, Schematic 57, 65
  Follow-Up, Simplified Diagram 55
  General Description 71
  Gyro, Schematic 57
  Master Compass, Schematic 73
  Overload Relay, Schematic 69
  Repeater Panels 77
  Repeater Schematic 72
  Repeater Switch 79
  Synchro Motor 87
Wiring, Repeater 68
Xenon, Gas Filled Rectifier Tubes C6A 59
Yawing, Effect on Damping Cut-Out 33
  Effect on Follow-Up System 48
Zero, Electrical
  Commutator Transmitter 106
  Synchro Motor 106
 

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