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Leyden jar(lī`dən), form of capacitorcapacitor
device for the storage of electric charge. Simple capacitors consist of two plates made of an electrically conducting material (e.g., a metal) and separated by a nonconducting material or dielectric (e.g.
..... Click the link for more information. invented at the Univ. of Leiden in the 18th cent. It consists of a narrow-necked glass jar coated over part of its inner and outer surfaces with conductive metal foil; a conducting rod or wire passes through an insulating stopper in the neck of the jar and contacts the inner foil layer, which is separated from the outer layer by the glass wall. By modern standards, the Leyden jar is cumbersome and inefficient. It is rarely used except in laboratory demonstrations of capacitance.
Leyden jar[′līd·ən ‚jär]
An early type of capacitor, consisting simply of metal foil sheets on the inner and outer surfaces of a glass jar.
Physics an early type of capacitor consisting of a glass jar with the lower part of the inside and outside coated with tin foil