DTM Geophysical Laboratory Library DTM Views Album, Volume XXV: Image 87 | ARC Archives Catalog
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DTM Geophysical Laboratory Library DTM Views Album, Volume XXV: Image 87
Cape Town Polar Year Magnetic Observatory. From left to right: House for absolute measurements; clock house, switch board and batteries; and recording house containing two sets of D, H, and Z instruments with slow and quick running drums. (Received from Prof. A. Ogg, August 17, 1933)
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