Telephone magneto
Hand-cranked electrical generator / From Wikipedia, the free encyclopedia
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For other uses, see Magneto (disambiguation).
A telephone magneto is a hand-cranked electrical generator that uses permanent magnets to produce alternating current from a rotating armature. In early telegraphy, magnetos were used to power instruments, while in telephony they were used to generate electrical current to drive electromechanical ringers in telephone sets and activate signals on operator consoles.