This swimmie-talkie uses water as a medium for sending high-frequency sound waves, on the principle of the hydrophone employed in the early 1900s for communicating between ships, and in World War I for detecting submarines.
Being adjusted here on a frogman, the Aquavox includes a face-mask mike, transducer (on belt, left), transceiver (right), earphones (on thigh). Cotton Associates, Philadelphia, developed it in 1957.
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