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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Fig. 15. Views of Trolley Pulley Showing Ring by Which Trolley Is Shifted from one another at A and B, Fig. 13. The springs H exert a pres-sure of about 32 pounds against the conductors and allow a limitedupward and downward motion of the bows. The whole device isfree to move a considerable distance from side to side without anydanger of damage. The weight of the collector is about 12 pounds.The cable is connected to the car by a spring-controlled cable drum,which keeps the cable tight. 394 TRACKLESS TROLLEY TRACTION 15 Motor. The motive power consists of one direct-currentseries-wound motor which is geared to the back axle. It has anormal rating of 18 horsepower, but may be operated up to a maxi-mum of 35 horsepower at G50 revolutions. The controller is of theordinary drum type with 5 running steps and 2 braking steps. Themaximum speed developed is 15 miles per hour. Cars. The cars are 21 feet long by 7 feet wide and lOJ feet
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Fig. 16. Leeds Trackless Trolley Car. Guard Shifting TrolleysCourtesy of Southern Electrician high. The capacity of each is 20 passengers and the weight emptyis 3.2 tons. English Railless System. A railless traction system which hassome rather unique features, has been lately developed in England.The system is very generally used, especially in Leeds and Bradford;installations are also under consideration in many other places. Trolley Wires. Figs. 14 and 15 give the construction of the sus-pension and collection devices. Four wires of No. 0000 W. S. G.hard-drawn copper are provided, thus avoiding breaking contactsin case cars meet each other. The trolleys may be suspended by 395 16 TRACKLESS TROLLEY TRACTION poles or brackets, or fastened to houses as the case may be, the twopositive wires being arranged inside and the two negative wires out-side. Direct current at 525 volts is supplied to the motors. Current-Collecting Device. The collector, which resembles theSchiemann, consists of

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