Dynamo
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“...in which is shown as electromagnet mounted with its poles in proximity to those of a steel magnet, and connected with a driving-wheel and belt, by which it can be given a rapid rotary motion, so that its poles alternately rotate past those of the steel magnet, producing an alternate reversal of polarity in its core by which an alternating current is generated in its coils.” -Atkinson 1903
Source
Atkinson, Philip Electricity for Everybody; Its Nature and Uses Explained (: The Century Company, 1903) 114
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