International Library of Technology · Scranton, International Textbook Co. · leaf 442
s projection goes intoone end of the spring; an iron dog (^ that moves around thesame center as the rocker casting R has a slight projectionthat goes into the other end of spring s. In case the trolleyrope breaks or for any other reason the pole flies up, rib /of casting R compresses spring s and… … Fig. 13. 9. Pressure Between Wlieel and Wire.—The pressurewith which the wheel presses against the trolley wire variesfrom 12 to 20 pounds, according to local conditions and tothe speed at which the car is to be run. If the pressure istoo light, the pole will be continually jumping off the wireat…
Electrical engineering
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