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https://www.noaa.gov/media/digital-library-photo/pl23theb1151jpg-0Description
Twelve inch repeating circle (bottom) and heliotrope (top).Fig. No. 27, Report of Superintendent ... 1866 (Image credit: NOAA Central Library)
Credit
NOAA Central Library
Display Date
1866
Collection
Historic Coast & Geodetic Survey
Keywords
Geodesy
Instruments