Ferdinand Hassler's observing tent.
Probably the original sketch was by John Farley
Image ID: theb1565, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: New York area
Photo Date: 1838?
Credit: NOAA Central Library
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of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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June 10, 2016