WATER DEPTH TELEMETER


Posted on Feb 4, 2014

Determines exact depth of trawl net under water, for interception of desired school of fish. Continuous depth information is transmitted to trawler by modulated 21-kc ultrasonic beam, along with water temperature. -F. H. Stephens, Jr. , Underwater Telemeter for Trawl Fishing, Electronics, 32:13, p 66-68.


WATER DEPTH TELEMETER
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