808 fathometer transducer.
Hydrographic Manual 1942.
Called first portable sonic sounding device.
First acoustic sounding device used on C&GS sounding boats for shallow water.
First use of shallow water fathometer continuous records by C&GS
Image ID: theb2155, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Credit: NOAA Central Library
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November 10, 2017