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https://www.noaa.gov/media/digital-library-photo/pl23theb4160jpg

Description

Leveling operations. Umbrella used to shade instrument from sun whichcauses derangement from level of the instrument. (Image credit: Collection of Captain Marvin Paulson, U.S. Coast and Geodetic Survey (ret.))

Credit

Collection of Captain Marvin Paulson, U.S. Coast and Geodetic Survey (ret.)

Display Date

1940 circa