. The Street railway journal . gers allow thetrolley wire to hang below the arm, and no further insulat-ing devices are needed on these poles, except where thereis a lateral strain on the wire. A steady strain device ofthe wooden-arm type is used on all curves where bracketsexist. This is the standard wooden arm steady strain withskirt type insulator which the Westinghouse Company nowfurnishes for bracket catenary construction. The porcelain insulator holding the steady strain rod iscarried in a malleable iron yoke adjustable on the bracketarm. The steady strain rod is made of a thoroughly im-
. The Street railway journal . gers allow thetrolley wire to hang below the arm, and no further insulat-ing devices are needed on these poles, except where thereis a lateral strain on the wire. A steady strain device ofthe wooden-arm type is used on all curves where bracketsexist. This is the standard wooden arm steady strain withskirt type insulator which the Westinghouse Company nowfurnishes for bracket catenary construction. The porcelain insulator holding the steady strain rod iscarried in a malleable iron yoke adjustable on the bracketarm. The steady strain rod is made of a thoroughly im-pregnated wooden rod having malleable iron end is used on account of the trolley wire being closer tothe bracket arm than when the sleeve type insulator is addition to using these on curves, one is put on in everytwelve poles on the tangents. A sketch of the section break used is shown. Since themessenger and the trolley wire are both electrically con-nected, it is necessarv to break the current on both these. : INTERIOR OF POWER STATION conductors. The messenger wire is cut at the point of thechange of circuit and the ends are fastened to separate lineinsulators, the insulators being suspended from the hori-zontal arm of the bracket, as shown in sketch. To break the current upon the trolley wire a piece ofsecond growth hickory, treated to make it moisture proof,is introduced into the line. The ends of this block are pro-vided with terminals into which the ends of the trolley 40 STREET RAILWAY JOURNAL. [Vol. XXXL No. 2. wire are fastened, the construction of the terminals andthe shape of the wooden arm being such that the trolleypasses smoothly from one circuit to the other across theintervening space without leaving the line. The arc isbroken on the terminal casting. The line breaks used are at the sub-station and one atKingsville near the power station and car shed. This
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
