ASDIC
The Oxford Companion to World War II
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2001
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© The Oxford Companion to World War II 2001, originally published by Oxford University Press 2001. (Hide copyright information)
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ASDIC, acronym of Allied Submarine Detection Investigation Committee, an Anglo-French organization which in 1917 began evolving a system of detecting submerged submarines by sound: it emitted a pulse which was then picked up when it rebounded from a submarine's hull. By 1938 it had been fully developed by the British who, for a time, regarded it as the answer to
submarine warfare. But though it was, within limits, effective, it could only gauge the distance and direction of the target which was why a pattern of depth charges had to be set to explode at different depths (see
anti-submarine weapons). The US Navy developed a similar system which it called Sonar and in 1943 the Royal Navy adopted the same name.
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