Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 428
mon: such as running withoutrails; using two trolley wires, one acting as a return circuit to takethe place of the rails in the ordinary track system; equipping carswith 4 more or less heavily rubber-tired wheels; using direct currentwith a voltage of 450 to 550. Only one system has been… … Fig. 1. Double Trolley Insulator Used in the Schiemann System Trolley Wires. The trolley wires, which are put 17 to 20 feetabove the ground and spaced 13 inches apart, are secured to clampsfastened to insulating plugs so that the current collector can makecontact with the wires from below. The…
Electrical engineering
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