pl23_theb2154.jpg
![Leo Otis Colbert with Dorsey Fathometer No theb2154.jpg Leo Otis Colbert with Dorsey Fathometer No](https://s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb2154.jpg)
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
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