Underground magnetic observatory built at the University of Wisconsin in 1870's.
Built under direction of Coast Survey.
Observations made to Coast Survey specifications.
One of many academic geophysical observatories built under guidance of C&GS
Image ID: theb1324, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: Wisconsin, Madison
Photo Date: 1879
Credit: Harper's New Monthly Magazine, March 1879, p. 520. NOAA Central Library
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