A
Leyden jar, or
Leiden jar, is a device that "stores"
static electricity between two electrodes on the inside and outside of a glass jar. A Leyden jar typically consists of a glass jar with metal foil cemented to the inside and the outside surfaces, and a metal terminal projecting vertically through the jar lid to make contact with the inner foil. It was the original form of a
capacitor (originally known as a "condenser").