The concept of the leyden jar was invented by the ancient Greeks and then expanded on by a German scientist in 1745. A typical design consists of a top electrode connected, by a chain, to a metal foil, coating part of the inner surface of a glass jar. A conducting foil is wrapped around the outside of the jar. The jar is charged by an electrostatic generator connected to the inner electrode while the outer plate is grounded. The inner and outer surfaces of the jar store equal, but opposite charges. Leyden jars are typically used to build and store electricity and is currently known as a capacitator.
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