. The Street railway journal . preferred to tar, as the latter is apt toshrink and crack, thereby allowing water to reach the ironand rust it. Where the poles are rusty, they are first scraped withsteel brushes and painted. The first coat is a red paint,which is followed by a coat of graphite. A coat of paintlasts usually about three years, except on lines near theChicago River, where the gases from the foul water in theriver cause the poles to deteriorate rapidly. It is worthyof note also that the trolley wire on lines adjacent to theriver oxidize much faster than others, and a bright copper
. The Street railway journal . preferred to tar, as the latter is apt toshrink and crack, thereby allowing water to reach the ironand rust it. Where the poles are rusty, they are first scraped withsteel brushes and painted. The first coat is a red paint,which is followed by a coat of graphite. A coat of paintlasts usually about three years, except on lines near theChicago River, where the gases from the foul water in theriver cause the poles to deteriorate rapidly. It is worthyof note also that the trolley wire on lines adjacent to theriver oxidize much faster than others, and a bright copper An iron cap is placed at the top of each pole, and there isan ornamental cast-iron ring at each joint. Ordinarily,the pole band (Fig. 5, No. 41) is placed 10 ins. from thelop of the pole. On some lines the poles carry an orna-mental hanger for supporting electric lamps, these beinginstalled and maintained by the city. Cross arms are ofwood, with supporting iron brakes. After trying nearly all kinds of trolley line switches on. FIG. 1.—OVERHEAD WIRE BRACKET FOR SURFACE LINESON ELEVATED RAILWAY STRUCTURE the market, a standard (Fig. 5, Nos. 9 and 12) has beenadopted. No. 9 shows a Y shaped, and No. 12 a right-hand switch, with the corresponding left-hand. No. 1 isan insulated cross-over. This is composed of a section of
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
