pl23_theb1297.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb1297jpgDescription
Measuring absolute value of declination with a declinometer.
Credit
Merchant Marine Bulletin, September 1931, p. 7
Display Date
1931
Location
Maryland, Cheltenham Observatory
Collection
Historic Coast & Geodetic Survey
Keywords
Geophysics
Geomagnetism