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![Leveling operations theb4160.jpg Leveling operations](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb4160.jpg?itok=LWSS_Piy)
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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. (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
Collection
Historic Coast & Geodetic Survey