Brush dynamo

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“A shaft runs through the machine from end to end, carrying a pulley, P, at one end, a commutator, c, at the other end, and a wheel armature, R, at the middle. The armature carries eight or more helices of insulated wire, H H, connected in pairs. As the shaft is turned by the action of the belt upon the pulley, the armature and the commutator are turned with it.” — Avery, 1895

Source

Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 496

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