. The Street railway journal . ion. The whole constructionis extremely rigid, and is stronger and more conducive to a October 12, 1907.] STREET RAILWAY JOURNAL. 655 long life for the pole than any bracket hitherto used. Wherenecessary, at switches, extra long brackets are employed,being lengthened by splicing and an extra truss rod beingattached by means of a clamp, to the outer end of such abracket, and run to the extreme top of the pole. The insulator pins are of malleable iron, of a typespecially devised for this work. The lower portion of thepin was divided and fitted closely over the flan
. The Street railway journal . ion. The whole constructionis extremely rigid, and is stronger and more conducive to a October 12, 1907.] STREET RAILWAY JOURNAL. 655 long life for the pole than any bracket hitherto used. Wherenecessary, at switches, extra long brackets are employed,being lengthened by splicing and an extra truss rod beingattached by means of a clamp, to the outer end of such abracket, and run to the extreme top of the pole. The insulator pins are of malleable iron, of a typespecially devised for this work. The lower portion of thepin was divided and fitted closely over the flanges of thetee bracket, being provided with a single ^-in. bolt bymeans of which the lower split portion of the pin is clampedsecurely against the bracket. The brackets and pins werefurnished to the engineers designs, by the Electric ServiceSupplies Company. The insulator is of the R. Thomas & Sons manufacture,6% ins. in diameter, and 6 ins. high, made in two parts,but of the three-petticoat type, and known as the No. TROLLEY HANGER CATENARY CONSTRUCTION It was designed by the engineers especially for this installa-tion. As most of the overhead work was done during thewinter months, and had to be rushed, a quick-setting cementof litharge and glycerine was used in place of Portlandcernent, which not only enabled rapid work in construction, l YI 1 but obviated troubles due to the freezing of hydrauliccement while setting. The insulator pins are ordinarily about 12 ins. from theend of the bracket, but there is 27-J/2 ins. space betweenthe end of the bracket and the point where the truss rods support it, which enables sufficient variation in location ofinsulator to meet most of the requirements in shifting thealignment of the trolley wire on curves. The messenger wire is of extra high strength steel,furnished by the American Steel & Wire Co. It is of sevenstrands and is 7/16 in. in diameter. Joints are made byusing the so-called open and closed cable sockets, thesockets being
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
