|physics an early type of capacitor consisting of a glass jar with the lower part of the inside and outside coated with tin foil|
|[C18: first made in Leiden]|
|Leyden jar (līd'n) Pronunciation Key
An early device for storing electric charge that uses the same principle as a modern capacitor. It consists of a glass jar with conductive metal foil covering its inner and outer surfaces, with the glass insulating these surfaces from each other. The inner surface is charged (by an external source) through an electrode penetrating the top of the jar; the inner and outer foil layers can then hold an equal and opposite charge.
device for storing static electricity, discovered accidentally and investigated by the Dutch physicist Pieter van Musschenbroek of the University of Leiden in 1746, and independently by the German inventor Ewald Georg von Kleist in 1745. In its earliest form it was a glass vial, partly filled with water, the orifice of which was closed by a cork pierced with a wire or nail that dipped into the water. To charge the jar, the exposed end of the wire was brought into contact with a friction device that produced static electricity. When the contact was broken, a charge could be demonstrated by touching the wire with the hand and receiving a shock. In its present form, the inner and outer surfaces of an insulating jar are coated with sheets of metal foil. The outer coating is connected to earth, and a suitable connection is made with the inner coating through a central brass rod that projects through the mouth of the jar. In addition to its use for classroom demonstrations, the Leyden jar is of importance as a prototype of capacitors, which are widely used in radios, television sets, and other electrical and electronic equipment.
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