Sourced from the book, The Norwegian Aurora Polaris Expedition 1902-1903, Volume 1: On the Cause of Magnetic Storms and The Origin of Terrestrial Magnetism, Section 2. Chapter VI: p.667 (published in 1913), By en:Kristian Birkeland (1867-1917) also on the Web at http://www.catastrophism.com/texts/birkeland/
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Uploaded by Jan Tresman; original image by Kristian Birkeland
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18:26, December 1, 2005 Iantresman (+443) . . (Kristian Birkeland's magnetised terrella simulating a spiral nebula. Sourced from the book, The Norwegian Aurora Polaris Expedition 1902-1903, Volume 1: On the Cause of Magnetic Storms and The Origin of Terrestrial Magnetism, Section 2. C)
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