Illustration showing Lodestone on board, floating

Illustration showing Lodestone on board, floating in bowl of water. It was possible to demonstrate in this way that however placed it would come to rest with a north/south orientation (star shaped objects are pointers), From Athanasius Kircher Magnes sive de Arte Magnetica, Cologne, 1643

1643 Athanasius Cologne Compass Demonstrate Displacement However Kircher Magnes Magnetica Magnetism North South Orientation Placed Pointers Possible Sive Tension

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