Digital Library Search
![Operator using Dorsey Fathometer with flashing light method theb2153.jpg Operator using Dorsey Fathometer with flashing light method](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb2153.jpg?itok=aZpEBHMY)
Description
Operator using Dorsey Fathometer with flashing light method.Merchant Marine Bulletin No. 9, May 1931 (Image credit: NOAA Central Library)
Credit
NOAA Central Library
Collection
Historic Coast & Geodetic Survey
Nautical Charting
Soundings
Acoustic Sound Systems
Keywords
Charting
Soundings
Electronic