Identifier: cyclopediaofappl05amer (find matches)
Title: 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.
Year: 1916 (1910s)
Authors: American Technical Society
Subjects: Electric engineering
Publisher: Chicago : American Technical Society
Contributing Library: Northeastern University, Snell Library
Digitizing Sponsor: Northeastern University, Snell Library

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s, and for resorts, and other seasonal traffic; (2) as feeders toelectric street railways; (3) in city streets where, either because oftraffic or of the narrowness of streets, a fixed route is impossible;(4) in rural and interurban districts for transportation of personsand of farm produce. 382 TRACKLESS TROLLEY TRACTION 3 SYSTEMS Several trackless trolley systems have been developed in thelast decade and are more or less used in different countries. Theseall have certain characteristics in common: 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 equippedwith single-phase alternating current. Schiemann System. The Schiemann System is used mostly inGermany with some installations in Norway, in Italy, and in France.The details of the system are as follows:
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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 general arrangement ofthe insulators is shown in Fig. 1. Brackets or poles may be usedfor supporting the conductors in the same way as with commontrolley wires. Current-Collecting Device. The difficulty encountered withcurrent-collecting devices lies in the fact that the car must be givena certain radius of action in order to meet or overtake other vehicles.The construction of the collector adopted in the system is shown inelevation and plan view, Fig. 2. The base A is fastened to the roofof the car and carries the rotary housing B. The contact pole C ispivoted to B and is pressed upward by a strong spring D against the 383 4 TRACKLESS TROLLEY TRACTION conductors. To the upper end of the pole C

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