TM 9-2660 Instruction Guide: Sound Locator M2, 1940-10-11 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

Cover title

"Prepared by the Sperry gyroscope company ... for the use of the War department. It is a revision of part 1 of the Handbook of the sound locator M2, which will not be republished."

"October 11, 1940."

Includes bibliographical references (page 44) and index

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