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Image from page 354 of “Canadian engineer” (1893)
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Identifier: canadianengineer22toro
Title: Canadian engineer
Year: 1893 (1890s)
Authors:
Subjects:
Publisher: Toronto, Monetary Times Print. Co. [etc.]
Contributing Library: Engineering – University of Toronto
Digitizing Sponsor: University of Toronto
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Text Appearing Before Image:
with a top diameter of 6 inches, and 7 inches atbase, with a top diameter of 5 inches ; the weight of theseare 1,213 pounds and 8go pounds each. The overhead wires {+ and —) are of 0000 S.VV.G.grooved, hard drawn, copper. Fig. i shows the imethod ofwire support from the bracket; the tWO outer ones beingnegative and the central ones positive. The bracket arm supporting these extends 18 feet fromthe pole. This method of construction gives double insula-tion between the two positives and treble insulation betweenthe bracket arm and the negative. This system is arranged in such a manner as will allowthe extension of the existing track tramway system, shouldpecuniary circumstances call for such; the current is sup-plied to the feeders from the pre-existing power station, thepressure being 525 volts, direct current. Section boxes and section insulators divide the positivewires into half-mile sections as in. standard tramway practice,but the negative wires are continuous from end to end of
Text Appearing After Image:
Fig. 2.—Railless Trolley the route, and cross connected at intervals of half a mile tominimize losses, and for the sajne reason the negative wiresare bonded to the existing tramway rails near the terminus. The method of completing the circuit between the trolleyand motors is illustrated in Fig. 2. This, of course, is thecritical feature of the system. The trolley is of the under-running type, capable of al-lowing the vehicle to run at a distance of 15 ft. from thecentre of the wires, measuring from the centre of the vehicle.It is so arranged that the negative trolley may be put out ofaction, and thus allow the vehicle to run with the positivetrolley only on the line. 366 THE CANADIAN ENGINEEK A rail collector has been included in the fittings of the Volume 22. car. This is used when the vehicle is taken in or out ofthe central depot and where no overhead negative wires areprovided. It consists of a skate hing-ed at the rear end ofthe vehicle, and is provided with means for raising-
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