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CAVE_MAPPING_TRANSMITTER

2016-04-05 05:43  
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CAVE_MAPPING_TRANSMITTER
Transistorized 5-w, 2,000-cps generator of low-frequency magnetic induction fold direction finder feeds tuned loop in cave being mapped. Detector at surface locates vertical flux line over cave and also receives Morse code for communication.-E. R. Roesehlein, Mapping Caves Magnetically, Electronics, 33:39, p 61.