Annual Report 1862. No. 47 Chart of Iso-Magnetic Lines of Pennsylvania for 1842.
Declination 1842. Declination 1862. Inclination. Magnetic Stations.
Horizontal Force. Total Force.
Image ID: cgs06228, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1862
Credit: United States Coast Survey Annual Report 1862
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