A small electric generator with an armature rotating in a magnetic field, having a secondary winding that generates a high voltage, such as one used to generate a voltage sufficient to cause a spark to jump between the poles of a spark plug in an internal-combustion engine.

Part of a Local Battery telephone. It is also called a Generator. It is used to convert mechanical motion via a Crank to produce sufficient energy to ring other phones or to signal the Central Office.

A small generator of alternating current with permanent magnets, used in the ignition system of most modern aircraft engines because it produces a hotter spark at high engine speeds than a typical automobile battery system, and it does not depend on an external source of energy.

An electrical device which generates electrical current when it is rotated by an outside source of power. It needs no outside source of power such as a battery. It may produce either low or high tension current.