Many instruments were used by early scientists to study electricity. The Leyden jar is an early device for storing electric charge invented in 1745 by Pieter van Musschenbroek (1692–1761). It was the first capacitor. A capacitor is an electrical/electronic device that can store energy in the electric field between a pair of conductors. Leyden jars were used to conduct many early experiments in electricity. The original form of the device was just a glass bottle partially filled with water, with a metal wire passing through a cork closing it. The role of the outer plate was provided by the hand of the experimenter. Soon it was found that it was better to coat the exterior of the jar with metal foil.
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