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From '53 Hammond tech sheet

A shaded pole induction motor is used for starting the ToneGenerator, and is located at the right-hand end of the ToneGenerator as viewed from the back. The rotor of this motor slides endwise when current is supplied and engages a pinion on its shaft with a gear on the driveshaft of the ToneGenerator, bringing the ToneGenerator up to slightly greater than SynchronousSpeed.
This motor has a resistor added in series at the application of the RunSwitch. The loss of power caused the system to fall to SynchronousSpeed with the SynchronousMotor carrying the load.

See also: HowToStartAHammond

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