Leo Otis Colbert with Dorsey Fathometer No. 3.
The first effective shallow and deep water echosounder.
Operator watched flashing light.
On the ship OCEANOGRAPHER
Image ID: theb2154, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: United States East Coast
Credit: NOAA Office of Coast Survey
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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June 10, 2016