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  • 21 Aug, 2019

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File:Descartes Magnetic Field.jpg

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current21:41, 9 October 2009Thumbnail for version as of 21:41, 9 October 20091,372 × 1,165 (582 KB)Chetvorno{{Information |Description=Drawing of the magnetic field of the Earth by René Descartes, from his ''Principia Philosophiae'', 1644. This was one of the first drawings of a magnetic field. |Source=Downloaded 2009-10-09 from [http://echo.mpi
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