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Leyden jar

The first electrical condensers, or capacitors, were named after the town of Leyden in the Netherlands, where one of the discoverers lived and worked at the university. The first were jars filled with water with a hand acting as the outer coating, but these were soon replaced by inner and outer coatings of metal foil, as in this case. After being charged by the electrical machine, the jar was discharged by touching simultaneously the brass rod and ball (connected to the inner coating) and the outer metal coating, for which brass tongs were used.

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