St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 158
nes. Whensome of the current is allowed to pass through a car,motion is produced in the motors, as has been explained.As the number of cars increases, more current passes backI to the dynamos, which must do more work to furnishsuch current. Trolley-poles, fastened tothe top of the cars andwhich end…
Electricity
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-360-155.webp)
