. The Street railway journal . esepoles, are drawn tight and thoroughlytied, so that there will be no sag inthem at these points, due to expansionand contraction. At all points where the transmis-sion line crosses foreign wires andsteam railways a special constructionwas used. The poles on each side ofthe crossing are securely head guyedand equipped with angle iron crossarms between which are held, on iron pins, porcelaine high tension insulators. Five-sixteenth-inchgalvanized iron steel span wires are drawn tight betweenthese insulators and the transmission conductors are broughtfrom the tria
. The Street railway journal . esepoles, are drawn tight and thoroughlytied, so that there will be no sag inthem at these points, due to expansionand contraction. At all points where the transmis-sion line crosses foreign wires andsteam railways a special constructionwas used. The poles on each side ofthe crossing are securely head guyedand equipped with angle iron crossarms between which are held, on iron pins, porcelaine high tension insulators. Five-sixteenth-inchgalvanized iron steel span wires are drawn tight betweenthese insulators and the transmission conductors are broughtfrom the triangular position to a horizontal plane and tiedto the span wires at 61 ft. intervals. This makes a verv wires, so that if they slacken they will come in con-tact with the arms. These arms as well as the arm sup-porting the strain insulators are grounded through a pieceof No. 4 wire attached to them and carried down the poleto a copper plate buried in charcoal in moist earth. The direct current feeders are carried on the trolley.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
