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![Leo Otis Colbert with Dorsey Fathometer No theb2154.jpg Leo Otis Colbert with Dorsey Fathometer No](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb2154.jpg?itok=jUefG8Rq)
Description
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 credit: NOAA Office of Coast Survey)
Credit
NOAA Office of Coast Survey
Location
United States East Coast
Collection
Historic Coast & Geodetic Survey
Nautical Charting
Soundings
Acoustic Sound Systems
Keywords
Charting
Soundings
Electronic