Page:Motors and motor-driving (1902).djvu/328

A multiplicity of arrangements may be adopted and have been adopted in electric cars, involving corresponding differences of structure in the running gear and the controlling arrangements. To begin with, a car may have one motor, which may

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be arranged to drive the rear wheels by chains from the ends of the motor-shaft, the driving wheels in this case running on a fixed rear axle. Or the driving wheels may be mounted on a live rear axle, the motor driving on to the compensating gear, either by a chain, by spur gearing, or by means of worm gearing, which gives a nice silent drive, and is used in the Oppermann cars. In any case the use of a single motor involves, in addition to the motor, a differential gear. What is