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Description
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 credit: NOAA Central Library)
Credit
NOAA Central Library
Collection
Historic Coast & Geodetic Survey
Nautical Charting
Soundings
Acoustic Sound Systems
Keywords
Charting
Soundings
Electronic