Sonar

Sonar (sound navigation and ranging) is a technique that uses sound propagation under water to navigate or to detect other watercraft. There are two kinds of sonar, active and passive.

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In 1906, Lewis Nixon invented the very first sonar-type listening device, as a way of detecting icebergs. During World War I, with the need to detect submarines, interest in sonar increased. The Frenchman Paul Langevin working with Chilowski invented the first sonar-type device for detecting submarines in 1915. His work influenced the future of sonar designs. These first sonar devices were passive listening devices. In 1916, under the British Board of Inventions and Research, Dr Boyle in the UK took on the project which subsequently passed to the Anti- (or Allied) Submarine Detection Investigation Committee which produced a prototype for testing in mid 1917 (hence the name ASDIC in British use).

Sound: :This article is about compression waves. For other meanings, see sound (disambiguation)....

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1906: 1906 was a common year starting on Monday (see link for calendar)....