. The Street railway journal . or a pressure of 6600 trolley is No. 000 grooved wire, and is suspended froma 7/16-in. seven-strand galvanized steel messenger cable bymeans of galvanized-iron trolley hangers, spaced approxi-mately 10 ft. apart. These hangers consist of short lengthsof pipe threaded at one end and flattened and punched atthe other. The threaded end engages in a socket which fitsover the threaded portion of two drop-forged steel lugs,which engage in the groove of the trolley wire. Thepunched end of the hanger is secured to the messenger cableby means of a strap-iron cla
. The Street railway journal . or a pressure of 6600 trolley is No. 000 grooved wire, and is suspended froma 7/16-in. seven-strand galvanized steel messenger cable bymeans of galvanized-iron trolley hangers, spaced approxi-mately 10 ft. apart. These hangers consist of short lengthsof pipe threaded at one end and flattened and punched atthe other. The threaded end engages in a socket which fitsover the threaded portion of two drop-forged steel lugs,which engage in the groove of the trolley wire. Thepunched end of the hanger is secured to the messenger cableby means of a strap-iron clamp bolted to it. On straight tracks the poles are spaced 120 ft. apart, buton curves this spacing has been reduced in proportion to thedegree of curvature. The trolley wire is suspended from standard T-iron bracket arm at an average height of about19 ft. above the top of the rail. One end of the bracket armis secured to a 35-ft. chestnut pole by means of iron strapsbolted to the bracket and fastened by lag screws to the SINGLE CATENARY CONSTRUCTION ON TANGENT The other end of the bracket is supported by means of around iron tension rod passing through the pole and se-cured to the bracket by a malleable iron lug. The messen- SINGLE CATENARY CONSTRUCTION ON CURVE ger cable is supported from, these brackets on porcelainmain-line insulators which are cemented upon malleableiron supports arranged to clamp upon the T-iron bracketarms. The insulators are placed on the bracket arms insuch a manner as to give a gradual staggering of the wire
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
