Drawing of a magnetic field by René Descartes, from his Principia Philosophiae, 1644. This was one of the first drawings of the concept of a magnetic field.

Drawing of a magnetic field by René Descartes, from his Principia Philosophiae, 1644. This was one of the first drawings of the concept of a magnetic field.

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    Drawing of a magnetic field by René Descartes, from his Principia Philosophiae, 1644.
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