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![Calibrating hydroacoustics with a copper sphere - also a tungsten sphereis used for this function fis00739.jpg Calibrating hydroacoustics with a copper sphere - also a tungsten sphereis used for this function](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fis00739.jpg?itok=HpvM3mNP)
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https://www.noaa.gov/media/digital-library-photo/pl23fis00739jpgDescription
Calibrating hydroacoustics with a copper sphere - also a tungsten sphereis used for this function. (Image credit: Crew and officers of NOAA Ship MILLER FREEMAN)
Credit
Crew and officers of NOAA Ship MILLER FREEMAN
Display Date
2005 July 29
Collection
Fisheries