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![The Sine galvanometer cgs02182.jpg The Sine galvanometer](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_cgs02182.jpg?itok=u_2CpNrz)
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https://www.noaa.gov/media/digital-library-photo/pl23cgs02182jpgDescription
The Sine galvanometer
Collection
Historic Coast & Geodetic Survey
Keywords
Coast and Geodetic Survey
Geophysics Geomagnetism