Shallenberger induction motor ampere- hour type, single phase, a. C., 20 amp, made by Westinghouse in America, circa 1900.

Physical Description

Uses vane retardation of a 4 bladed aluminium fan, the air resistance on which is proportional to the square of its speed of rotation and therefore to the amperes flowing through the motor. Serial no. 90241. The earliest A.C. Meter in general use.

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