File:Descartes magnetic field.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 21:41, 9 October 2009 | ![]() | 1,372 × 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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