Abstract
At the conclusion of his Epistula de magnete of 1269, Petrus Peregrinus de Maricourt described the construction of a continually moving toothed wheel that is powered by a magnet. The effectiveness of the device is enhanced by a small rounded weight made of brass or silver that is located between two of the theeth. According to the inventor, this metallic ball “seeks the center of the earth in virtue of its own weight, thereby aiding the motion of the teeth.”
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