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NOAA Photo Library Image - cgs02147

Edmund Halley's isogonic chart of 1701 showing lines of equal magnetic declination. This was the earliest chart of this nature and one of the earliest geophysical thematic maps.

Image ID: cgs02147, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1701


Category: Coast and Geodetic Survey/Geophysics Geomagnetism/

High Resolution Photo Available





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Last Updated:
April 30, 2013