Page:Popular Science Monthly Volume 57.djvu/494

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484
THE POPULAR SCIENCE MONTHLY.

ployed. The position of the motor, with reference to the carriage wheel, in the single motor design, is shown in Fig. 8. The gear attached to the carriage wheel is used also as a brake wheel, a friction band being located so as to bear against the periphery, while the pinion on the end of the motor shaft meshes into teeth on the inner side of the rim. This single motor design is also used in the omnibus made by the Columbia Company, a number of which are now in regular service on Fifth avenue, New York. These omnibuses, which are illustrated in Fig. 9, seat eight passengers, and are able to carry as many as are willing to crowd into them. One feature of the electric motor

PSM V57 D494 Position of motor in a single motor design.png
Fig. 8. Position of Motor in the Single Motor Design.

which fits it admirably for automobile service is the fact that for a short time it can put forth an effort far greater than its normal capacity, and it can do this at all times, without any special preparation. Owing to this feature it is practically impossible to stall the vehicle. If the wheels run into a rut or sink into a mud hole, the motor will be able to turn them around, and if they do not slip the carriage will be moved ahead.

The management of the vehicle is exceedingly simple and entirely free from care, the driver having nothing to tax his mind but the steering lever and the handle of the controlling switch. As the moving parts all have a rotatory motion and are perfectly balanced, there is no possibility of vibration, and there is an entire absence of heat or disagreeable odors.

Any one who has observed the action of a two-horse team will have noticed that, unless the pavement is very smooth, the tongue con-