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Electronic Fish Finders

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Animated drawings, diagrams, and some live photography explain the fundamental principles of the operation of electronic fish-finding equipment on trawlers: how soundpulses and their returning echoes can determine the location, density and depth of fish, and the type of sea bottom below. The spin-off of research into underwater-sound, this electronic equipment has already proved its value in increasing the yield for the deep-sea fisherman.

1969, 17 min 46 s