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Definition of "Magneto Switchboard" |
A telephone magneto is a hand-cranked electrical generator that uses permanent magnets to produce alternating current from the 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 on operator consoles. / A sealed glass tube containing a near-vacuum which allows the free passage of electric current. |
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