An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 566
e wheels turning, namely, the friction between the wheelsand rails. The force which is applied to the brake shoes is nowvery generally furnished by compressed air. There are severalsystems of air brakes which are adapted to various conditionsand kinds of service. All of these systems require a… … Fig. 357. — Street-car controller with the door open. Hi ^^B^^^^^^^^ l^^_^^^^5^BimmHBB^^^ 1TJ .n i eitfl ifil ir.Sia^ij- ■ nils ill | J1 B *iiM ^tHHBaHM^MM^ i»-~ ■- *^h ^^
Electricity · Magnetism
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