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Fathometer

depth sound water echo

Fathometer, underwater device used on ships to measure the depth of water. As the speed of sound in water is known, the fathometer works by sending a sound down through the water, to be returned by echo. The fathometer dispatches sound through a submarine oscillator and receives it through a hydrophone echo receiver. First manufactured in 1927, the fathometer is the trade name for a refined sonic depth finder. The first sonic depth finder was developed in 1919 by the U.S. Navy.

See also: Sonar.

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