English

Underwater sound equipment

Title on half-title page: Summary technical report of the National Defense Research Committee · "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Columbia University Division of War Research under contract OEMsr-1131 with the Office of Scientific Research and Development. This volume was printed and bound by the Columbia University Press"--Unnumbered page ii · LC Science, Business & Technology copy no. 171 (volume 1), 239 (volume 2), 3 (volume 3), 196 (volume 4), 64 (volume 5), 71 (volume 6) · In a set of declassified documents held as a collection by the Library of Congress · Includes bibliographical references and indexes · I. Listening systems -- II. Echo-ranging systems -- III. Scanning sonar systems -- IV. Frequency-modulated sonar systems -- V. Instruments, attack aids and miscellaneous ordnance -- VI. Countermeasures · 6 volumes : 28 cm

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