Measuring baseline with Invar Tape, maintaining constant tension during reading.
Making rear contact on bench over traverse station.
Image ID: cgs00561, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1938 July
Credit: NOAA Central Library Historical Imagery
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
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July 7, 2015