Torpedo Data Computer Mark 3, Mark 3, Mods 5 to 12 inclusive, O.P. 1056, 1944 describes the most successful torpedo fire control computer of WW II. It is considered a masterpiece of mechanical computing design.
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ORDNANCE PAMPHLET No. 1056
This Publication is RESTRICTED and will be handled in accordance with
Article 76, United States Naval Regulations, 1920
Prepared for the Bureau of Ordnance
Brooklyn, New York
BUREAU OF ORDNANCE
WASHINGTON, D. C.
ORDNANCE PAMPHLET NO. 1056-
TORPEDO DATA COMPUTER MARK 3 MODS. 5 TO 12.
1. This Ordnance Pamphlet contains information on the description, operation, maintenance, and installation of the Torpedo Data Computer Mark 3 Mods. 5 to 12.
2. The following publications pertain to the Torpedo Data Computer Mark 3 Mods. 5 to 12 and accessories:
O.S. No. 2182
Specifications for Torpedo Control System for Submarines
O.D. No. 2585
Gyro Setting Indicator Regulator Mark 1 and Mods. 1 and 2
O.D. No. 2561
Torpedo Data Computer Mark 3 Mods. 5 to 12, inclusive
3. Ordnance Data O.D. 2561 is now obsolete and should be destroyed upon receipt of this publication.
4. Ordnance Pamphlet O.P. 1056 is classified as restricted and should be handled in accordance with the provisions of Article 76, Navy Regulations, 1920.
G. F. HUSSEY, JR.
REAR ADMIRAL, U. S. NAVY
CHIEF OF BUREAU OF ORDNANCE