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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Sonar
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INFOTEXT
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1992-09-03
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370b
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11 lines
Sonar (sound navigation and ranging) is the
method of locating underwater objects by the
reflection of ultrasonic waves. The time
taken for an acoustic beam to travel to the
object and back to the source enables the
distance to be found since the velocity of
sound in water is known. Sonar devices, or
echo sounders, were developed 1920.
Subject by: Vince Pike