pl23_theb4160.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb4160jpg-0Description
Leveling operations. Umbrella used to shade instrument from sun whichcauses derangement from level of the instrument.
Credit
Collection of Captain Marvin Paulson, U.S. Coast and Geodetic Survey (ret.)
Display Date
1940 circa
Collection
Historic Coast & Geodetic Survey