![Magnetic field by 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 ( Magnetic field by 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 (](https://c8.alamy.com/comp/2BDX519/magnetic-field-by-ren-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-2BDX519.jpg)
Magnetic field by 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 (
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![Edinburgh New Philosophical Journal. Mechanical Illustrations of the Planetary Motions. 335 panying the magnet; and, if so turned before the introduc- tion of the magnet, the magnet will bring the ring Edinburgh New Philosophical Journal. Mechanical Illustrations of the Planetary Motions. 335 panying the magnet; and, if so turned before the introduc- tion of the magnet, the magnet will bring the ring](https://c8.alamy.com/comp/RDKN6G/edinburgh-new-philosophical-journal-mechanical-illustrations-of-the-planetary-motions-335-panying-the-magnet-and-if-so-turned-before-the-introduc-tion-of-the-magnet-the-magnet-will-bring-the-ring-into-a-concentric-position-permitting-its-introduction-into-it-while-a-non-magnetic-bar-cannot-be-so-introduced-the-magnet-instead-of-causing-collision-prevents-it-i-have-thus-both-by-theory-and-by-experiment-attempted-to-explain-that-phenomenon-hitherto-as-i-think-not-accounted-for-in-any-satisfactory-manner-and-to-show-that-it-rests-on-the-same-principle-as-the-standing-of-a-sp-RDKN6G.jpg)
Edinburgh New Philosophical Journal. Mechanical Illustrations of the Planetary Motions. 335 panying the magnet; and, if so turned before the introduc- tion of the magnet, the magnet will bring the ring
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