Jean Jallabert
Jean Jallabert, 1712-1768, investigating the effects of points and knobs on electrical discharges whilst standing on a wax insulating platform, one hand touching an electrostatic generator and the other holding a pointed piece of wood. When its point neared one end of a conducting rod mounted on a pivot, the deflection of the rod caused by the discharge showed whether there was a positive or negative charge. From Les Merveilles de la Science, published 1870. (Photo by: Universal History Archive/Universal Images Group via Getty Images)
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1756370497
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Universal Images Group
Date created:
January 01, 1870
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Universal Images Group Editorial
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