File:Descartes magnetic field.jpg
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English: Drawing of a magnetic field by French philosopher René Descartes, from his Principia Philosophiae, 1644. This was one of the first drawings of the concept of a magnetic field. It shows the magnetic field of the Earth (D) attracting several round lodestones (I, K, L, M, N) and illustrates his theory of magnetism. Descartes proposed that magnetic attraction was caused by the circulation of tiny helical particles, "threaded parts" (shown), which circulated through parallel threaded pores in magnets, in through the South pole (A), out through the North pole (B), and then through the space around the magnet (G, H) back to the South pole. Oppositely threaded particles circulated in the opposite direction. When the "threaded parts" came near a lodestone or piece of iron, they passed through its pores, causing magnetic force. Alterations to image: cropped, and cloned out intruding text around edges of drawing |
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| Source | Downloaded 2009-10-09 from René Descartes (1644) Principia Philosophiae, Ludovicum, Amsterdam, p.271 on ECHO (European Cultural Heritage Online) website | |||||||||||||||||||||||
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Public domain - Descartes died in 1650 | |||||||||||||||||||||||
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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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 (talk | contribs) | {{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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