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Computer Mark 1 and Mods (with Computer Mark 1A Addendum), Ordnance Pamphlet 1064, 1945 (1951 Addendum), describes the fire control computer used on guns from 5" to 16" aboard US Navy ships of WW II.

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RESTRICTED
OP 1064
COMPUTER MARK 1
AND MODS.
DESCRIPTION AND OPERATION
A BUREAU OF ORDNANCE PUBLICATION
19 JANUARY 1945


COMPUTER MARK 1 - OP 1064

TABLE OF CONTENTS
 

Page
INTRODUCTION 8
PART 1 GENERAL DESCRIPTION 9
The Computer Mark 1 in the Gun Director Mark 37 System 10
Automatic Fire Control in the Gun Director Mark 37 System 24
A simplified account of Tracking, Prediction, and Stabilization 28
A more detailed account of Tracking, Prediction, and Stabilization 43
Parallax Corrections 66
The Star Shell Computer Mark 1 68
Summary of Computer Mark 1 Data 72
Design Features of the Computer Mark 1 76
PART 2 OPERATION 79
OPERATING CONTROLS 80
The Dials on the Front of the Computer Mark 1 82
The Controls on the Front of the Computer Mark 1 94
Handcranks and Dials on the Rear Top of the Computer 102
The Target Course Indicator 106
The Star Shell Computer 107
OPERATING INSTRUCTIONS 110
The Four Types of Operation 112
Secured Condition 114
Standby Condition 116
Automatic Operation 120
Semi-automatic Operation 122
Manual Operation 126
Local Operation 136
Summary of Special Types of Operation 138
SAMPLE PROBLEM 148
OPERATING CAUTIONS 156
 
Page
PART 3 DETAILED DESCRIPTION
INTRODUCTION 161
THE DECK TILT GROUP 164
The Inputs to the Deck Tilt Group 165
The Deck Tilt Mechanism 166
THE RELATIVE MOTION GROUP 172
The Inputs to the Relative Motion Group 173
The Mechanism 175
Relative Motion for a Surface Target 178
Relative Motion for an Air Target 180
The Height Computer 184
THE INTEGRATOR GROUP 186
The Mechanism in the Integrator Group 187
Generated Changes of Range 189
Generated Changes of Elevation 190 Generated Changes of True Bearing 194
THE RATE CONTROL GROUP 202
The Four Main. Methods of Rate Control 204
Local Control 208
Manual Control of Rates 214
Semi-automatic Rate Control 218
The Rate Control Computing Mechanism 220
Making Rate Corrections in Semi-auto 232
Automatic Rate Control 240
The Target Course Indicator 254
 

2
 
Page
THE PREDICTION SECTION 266
The Mechanism in the Prediction Section 268
Computing Advance Range, R2 276
Computing Predicted Target Elevation, E2 280
Computing Sight Angle, Vs 284
Computing Sight Deflection, Ds 286
Computing Fuze Setting Order, F 288
Computing Wind Rates 292
Initial Velocity 308
Spots 312
THE TRUNNION TILT SECTION 314
Setting up the Line of Fire from the Horizontal 316
The Line of Fire from a tilted deck 318
The Mechanisms and the Equations 320
Computing Vz 321
Computing Dd 322
THE SYNCHRONIZE ELEVATION GROUP 326
The Synchronize Elevation Mechanism 332
The Elevation Lines in Continuous Aim 334
The Elevation Lines in Selected Level Fire with Elevation selected at the Director 335
The Elevation Lines in firing without a Director 336
 
Page
THE PARALLAX SECTION 338
A summary of the Parallax Corrections 342
Train Parallax Correction, Ph 343
Elevation Parallax Correction, Pv 346
The Parallax Shift Gears 348
Elevation Parallax Correction, Pe 350
Derivation of the Parallax Equations 354
THE STAR SHELL COMPUTER MARK 1 356
Star Shell Range 358
Star Shell Fuze Setting Order 359
Star Shell Gun Train Order 360
Star Shell Gun Elevation Order 362
THE SELECTOR DRIVE MARK 1 368
APPENDIX
LIMITS OF ACCURATE COMPUTATION 378
MODIFICATION DIFFERENCES 382
Major Modification Differences 383
Pertinent Serial Numbers 386
List of FORDALT's 388
List of ORDALT's 390
List of OD's 391
Details of Modification Differences 392
Table of Modification Differences 399
GLOSSARY OF QUANTITIES AND SYMBOLS 401
There is a detailed ALPHABETICAL INDEX on page 421
There is a schematic diagram of the entire Computer Mark 1 at the end of this pamphlet 433
 

3
 
COMPUTER MK 1A - OP 1064 Addendum

TABLE OF CONTENTS
 

Page
INTRODUCTION 1
GENERAL DESCRIPTION
Basic Mechanisms 2
Types of Targets and Attack 3
Automatic Fire Control in the Gun Director Mk 37 System 3
Tracking the Target 3
The Rate Control Group 3
How Rate Control Corrects Rate of Climb, Target Speed, and Target Angle 4
Another Way to Think About Rate Control 5
Parallax Correction 5
The Star Shell Computer 5
Inputs and Outputs of Computer Mk 1A 5
SUMMARY OF COMPUTER MK 1A DATA 6
Size - Weight - Power Supply 6
Limits of Operation 6
Design Features 14
OPERATION
OPERATING CONTROLS 15
The Dials on the Front of Computer Mk 1A 15
Time Motor and Power Switches 15
Initial Velocity and Dead Time 17
The Controls on the Front of Computer Mk 1A 17
The Controls in the Target and Ship Group 17
The Controls at the Range Station 17
The Controls at the Bearing Station 18
The Controls at the Elevation Station 18
Handcranks and Dials on the Rear Top of the Computer 18
The Target Course Indicator 19
The Star Shell Computer 19
OPERATING INSTRUCTIONS 20
The Conditions of the Computer 20
Types of Operation 20
Instructions for Operating Computer Mk 1A 20
 
Page
Secured Condition 20
Standby Condition 21
Standby for an Air Target 21
Automatic Operation 21
Manual Operation Against an Air Target 22
Standby for a Surface Target 22
Automatic (Normal) Operation (Surface Target) 22
Local Operation 22
Main Battery Operation 22
Operating Cautions 22
DETAILED DESCRIPTION
Relative Motion and Integrator Groups 23
Increase of Target Speed 23
Shaft Values 23
Integrator Group 23
RATE CONTROL 24
Handcranks and Dials Used in Rate Control 24
The Rate Control Computing Mechanism 24
The Rate Error Correction Measuring Network 24
Target Motion Correction Computing Network 25
Sensitivity Control 28
Sensitivity Control of Range Rate Control Network 32
Sensitivity Control of the Elevation and Bearing Rate Control Networks 32
Summary of Operation of the Elevation and Bearing Sensitivity Control Network 34
Local Control 37
Normal (Automatic) Control 37
Automatic Tracking Controls 37
The Control Switch 42
The Range Rate Control Switch 42
Time Motor Control System 42
The Low E Switch 44
The Target Course Slew System 45
Control of Range Input 45
Low Range Switch 46
 

4
 
Page
PREDICTION SECTION 46
Computing Advance Range, R2 47
The Elevation Prediction Network 47
Computing Sight Deflection, Ds 48
Computing Fuze Setting Order, F 48
Initial Velocity 50
SPOTS 50
Elevation Spot for Surface Fire 50
Gun Orders 50
THE SYNCHRONIZE ELEVATION GROUP 50
The Elevation Transmitter 50
 
Page
Parallax 51
Parallax Range 51
Elevation Parallax Correction, Pe 51
MOD DIFFERENCES 52
Serial Numbers 52
List of Fordalts 52
List of Ordalts 53
Table of Modification Differences 53
COMPARATIVE INDEX 57
There is a schematic diagram of the entire Computer Mark 1A at the end of this addendum 59

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