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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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RESTRICTED ORDNANCE PAMPHLET No. 1056
TORPEDO DATA COMPUTER
MARK 3, Mods. 5 to 12 Inclusive
Department of the Navy
Bureau of Ordnance
A Bureau of Ordnance Publication June, 1944



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RESTRICTED ORDNANCE PAMPHLET No. 1056


TORPEDO DATA COMPUTER
MARK 3, Mods. 5 to 12 Inclusive
Department of the Navy
Bureau of Ordnance

JUNE, 1944


This Publication is RESTRICTED and will be handled in accordance with Article 76, United States Naval Regulations, 1920



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Prepared for the Bureau of Ordnance
by the
ARMA CORPORATION
Brooklyn, New York


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NAVY DEPARTMENT
BUREAU OF ORDNANCE
WASHINGTON, D. C.

RESTRICTED JUNE, 1944

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. 2182Specifications for Torpedo Control System for Submarines
O.D. No. 2585Gyro Setting Indicator Regulator Mark 1 and Mods. 1 and 2
O.D. No. 2561Torpedo 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.

G. F. HUSSEY, JR.
REAR ADMIRAL, U. S. NAVY
CHIEF OF BUREAU OF ORDNANCE


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TABLE OF CONTENTS

SECTION 1-Analysis of the Fire Control Problem 11
Terminology and Symbols 13
  Distances 13
  Speeds 15
  Time 15
  Angles 15
Review of Trigonometry 18
Derivation of Equations 21
  General Problem 21
  Derivation of Equations Solved by the Position Keeper 22
  Derivation of Equations Solved by the Sound Bearing Converter 27
  Derivation of Equations Solved by the Angle Solver 29
SECTION 2-Fundamentals of Components of the Data Computer 33
Differentials 34
Integrator 42
Resolvers 44
Proportionator 48
Follow-up Head 50
Cams 52
Dials 54
SECTION 3-Function 55
General Function of the Computer 56
Mechanical Follow-up Heads 58
Integrator Unit 66
Divider Unit 67
Position Keeper 68
  Functional Diagram of Position Keeper and Sound Bearing Converter 68A
  Functional Description of Position Keeper 69
  Gear Diagram of Position Keeper and Sound Bearing Converter 75A
The Sound Bearing Converter 76
  Unit Assembly Diagram of Position Keeper and Sound Bearing Converter 78A
Resolver Unit 79
Proportionator Unit 80
Differential Unit 81
Cam Unit 82
Base Line Resolver 84


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SECTION 3-Function-Continued  
Angle Solvers 85
  Functional Diagram of the fwd Angle Solver 86A
  Functional Description of the Angle Solver 87
  Gear Diagram of the fwd Angle Solver 93A
  Unit Assembly Diagram of the fwd Angle Solver 95A
Internal Wiring Diagram of Angle Solver and Position Keeper 97A
SECTION 4-Construction 99
General 100
Position Keeper Section 104
  Exterior 104
  Interior 105
Dials 107
Angle Solver Section 108
  Exterior 108
  Interior 109
  Dials 111
Interconnection of the Cases 113
Resolver Unit 114
Proportionator Unit 120
Differential Unit 124
Detent Mechanism 126
Divider Unit 127
Time Motor Governor 128
Integrator Unit 129
Sound Bearing Converter 132
Cam Unit 136
Stops 142
Follow-up Heads 143
SECTION 5-Disassembly and Reassembly 145
Separation and Removal of Chassis 146
  Removal of Position Keeper From Case 152
  Removal of Angle Solver From Case 154
Disassembly of Position Keeper Chassis 157
Disassembly of Angle Solver Chassis 163
Reassembly of Position Keeper 170
Reassembly of the Angle Solver 186
Securing the Sections in Place 204
SECTION 6-Tests 217
Position Keeper Tests 218
  For Mk. 3, Mods. 5 to 12, Inc. 220


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SECTION 6-Tests-Continued  
  For Mk. 3, Mods. 5-9, 11 and 12, only 222
  For Mk. 3, Mods. 5-9 and 12, only 222
  For Mk. 3, Mod. 10, only 224
  For Mk. 3, Mods. 10 and 11, only 224
  Position Keeper Notes 224
Angle Solver Tests 224
  For Mk. 3, Mods. 5 to 12, Inc. 226
  Angle Solver Notes 232
Sound Bearing Converter Tests 233
  Sound Bearing Converter Note 233
SECTION 7-Installation 235
SECTION 8-Adjustments 247
Thermostat 248
Time Motor Governor 248
Slip Clutches 248
Follow-up Motor Damps 248
Angle Solver Range Stop Switches 250
Offset Angle Zero Detent Switches 250
Integrator Unit and Divider Unit Discs 250
Synchro Motor and Generator Electrical Zero 250
Mechanical Follow-up Heads 250
Correct Solution Light Switches 252
Dials 254
Sound Base Line 254
Tube Base Line 254
Cam Unit Settings 256
Replacing Uy and M Knob Dials 256
Replacing Angle Solver Front Cover 256
SECTION 9-Lubrication 259
Synchro Bearings 260
Follow-up Heads 260
Integrator Discs and Time Motor 261
Miscellaneous 262
SECTION 10-Appendix 263
General Information 264
Inputs and Outputs 265
Dial and Counter Graduations 267
Relative Speeds 271
Principal Drawings 271
Element Numbers 272
Exercising Stored Instruments 276
Distribution List 277

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