Using compass declinometer for magnetic observations. Lt. Benjamin H. Rigg observing. Accompanied MacMillan Arctic Expedition.
Image ID: theb1304, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Location: Greenland Photo Date: 1926 Credit: C&GS Season's Report Rigg 1926-69 Category: Geophysics/Geomagnetism/ • High Resolution Photo Available
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