. The Street railway journal . FIG. 6.—PEARSON STREET CAR FIG. 7.—PEARSON JACK WITH CHAIN ATTACHMENT. July, 1896.] STREET RAILWAY JOURNAL. 4ri LETTERS AND HINTS FROM PRACTICAL MEN. Correct Location of Trolley Wire on Spiral Curves. vStrklton, Pa., June 6, Stkkkt Raiiavay JouknaIv: The method of locating the trolley wire on curves,given in the June issue of the Street Railway Journalis only apj^licable to the use of simple curves, while modernpractice tends towards using a true spiral curve of consid-erable length for the ends of all curves. For this portionof the curve, per
. The Street railway journal . FIG. 6.—PEARSON STREET CAR FIG. 7.—PEARSON JACK WITH CHAIN ATTACHMENT. July, 1896.] STREET RAILWAY JOURNAL. 4ri LETTERS AND HINTS FROM PRACTICAL MEN. Correct Location of Trolley Wire on Spiral Curves. vStrklton, Pa., June 6, Stkkkt Raiiavay JouknaIv: The method of locating the trolley wire on curves,given in the June issue of the Street Railway Journalis only apj^licable to the use of simple curves, while modernpractice tends towards using a true spiral curve of consid-erable length for the ends of all curves. For this portionof the curve, perhaps forty feet long or more, Mr. Fostersformula would not apply. The proper location can beeasily found by the use of a template of the essential ele-ments of the problem, i. e., the wheel base and the hori-zontal projection of the trolley pole. Having a plan of the curve for which the location oftrolley wire is desired to a scale of five feet to the inch orlarger, take a piece of thin transparent celluloid and cut itto the length of the wheel base (on the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
