Experiments with the electric machine were largely aided by the discovery that a glass plate, when coated on both sides with tinfoil, can accumulate a charge of electricity when connected with a source of electromotive force.
Experiments with the electric machine were largely aided by the discovery of the Leyden Jar. This early form of the capacitor, with conductive coatings on either side of the glass, can accumulate a charge of electricity when connected with a source of electromotive force.