Alternator

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“The alternator is a dynamo designed for the generation of alternating currents. It has collecting rings instead of a communtator so that the current is delivered just as it is generated, and a small direct current dynamo for engergizing its field magnets, the pole-pieces of which are generally very numerous.” -Avery 1895

Source

Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 501

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