An edition of Instruction Guide, Sound Locator M2
(1940)
Instruction Guide, Sound Locator M2
by United States War Department
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Last edited by ww2archive
August 10, 2016 | History
TM 9-2660 Instruction Guide Sound Locator M2, 1940-10-11
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Book Details
Published in
Washington, D.C., USA
Table of Contents
CONTENTS
Page
Authorization Page i
Foreword ii
Table of Contents in
List of Illustrations v
Glossary vi
Section I. Introduction 1
Section II. Principles of operation
I. General 2
II. Sound lag error 4
III. Wind error 8
IV. Parallax error 9
Section III. Description of mechanism
I. General 13
II. Acoustical system 14
A. Horns 14
B. Sound conducting tubing 15
C. Helmets 15
III. Corrector assembly 16
A. Main case assembly 16
Stationary assembly (base) 16
Revolving assembly (housing) 17
B. Pantograph drive assembly 19
Speed corrector assembly 19
Parallax offset mechanism 20
C. Corrector drive assembly 20
IV. Data transmission system 22
A. Data transmitters 22
B. Spring brush and terminal block assemblies 23
C. Cut-out switch 23
D. Cables 23
V. Platform and column 24
VI. Characteristics 24
Section IV. Operation
I. Assembling the sound locator 25
II. Orienting and synchronizing in azimuth 27
A. The searchlight 28
B. The sound locator 29
C. The control station 31
III. Orienting and synchronizing in elevation 31
A. The searchlight 31
B. The sound locator 31
C. The control station 31
IV. Preparing to track a target 31
V. Tracking a target 33
Section V. Routine maintenance Page
I. General 34
II. Transportation 34
III. Cleaning 35
IV. Check tests 37
A. Course indicator 37
B. Parallax pointer 37
C. Pantograph and sight mirror 37
D. Over-all tests (problems) 38
V. Lubrication 38
VI. Accessories 40
Section VI. Training of personnel
I. General 41
II. Choosing operators 42
III. Elimination examinations 42
IV. Field training 43
Appendix A. References 44
Appendix B. Computation of corrections
I. General 45
II. Sound lag correction 45
III. Parallax correction 50
IV. Combined sound lag and parallax correction 52
Appendix C. Inspection report — Sound locator M2 59
LIST OF ILLUSTRATIONS
Figure. Title. Page.
Frontispiece The Sperry sound locator and corrector.
1 Sound lag principle 4
2 Corrector principle 6
3 Ball analyzer principle 7
4 Application of ball analyzer principle 7
5 Action of ball analyzer 7
6 Wind effect principle 9
7 Parallax principle 10
8 Cross section of horn assembly 14
9 Pantograph drive assembly 18
10 Placing corrector assembly on column 26
11 Attaching azimuth horn to corrector assembly 27
12 Attaching elevation and common horn unit to corrector assembly 28
13 The corrector operator in action 29
14 Tracking a target 30
15 Listener's helmet 32
16 Stowage box for corrector assembly 35
17 Corrector assembly in stowage box 36
18 Front view — corrector assembly 39
19 Cross section of main case 40
20 Sound lag problem (horizontal view) 47
21 Sound lag problem (elevation view) 47
22 Sound lag problem (elevation view) 48
23 Parallax correction angle principle 51
24 Typical parallax problem 51
25 Sound lag and parallax combined 52
26 Altitude determination principle 54
27 Slant range determination principle 54
28 Slant plane (horizontal projection) 5
29 Actual slant range determination 55
30 Graph of parallax settings 56
31 Schematic gearing diagram 63
32 Schematic wiring diagram 64
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