pl23_theb2146.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb2146jpgDescription
Robert Williams with first Fessenden oscillator on the tug Susie D.First successful test of sonic system.Looking for icebergs but also found bottom
Credit
NOAA Central Library
Display Date
1914
Location
North Atlantic
Collection
Historic Coast & Geodetic Survey
Nautical Charting
Soundings
Acoustic Sound Systems
Keywords
Charting
Soundings
Electronic