. The Street railway journal . grounded every sixth pole to an ironbar driven in the ground, is run at thetop of the poles. A cross-arm justbelow the trolley bracket supports a telephone circuit oftwo No. 10 hard-drawn copper wires. These are carriedon No. 7 Locke insulators and are transposed every fourpoles. Cross-country telephone lines encountered havebeen placed 2 ft. under the track in iron conduit. Outsideof corporation limits the catenary trolley construction iscarried on tubular brackets, all of which were set with in-struments. On curves a span wire ties the bracket pole toa pole pla
. The Street railway journal . grounded every sixth pole to an ironbar driven in the ground, is run at thetop of the poles. A cross-arm justbelow the trolley bracket supports a telephone circuit oftwo No. 10 hard-drawn copper wires. These are carriedon No. 7 Locke insulators and are transposed every fourpoles. Cross-country telephone lines encountered havebeen placed 2 ft. under the track in iron conduit. Outsideof corporation limits the catenary trolley construction iscarried on tubular brackets, all of which were set with in-struments. On curves a span wire ties the bracket pole toa pole placed on the opposite side of the track, and this 790 STREET RAILWAY JOURNAL. [Vol. XXIX. No. i8. latter pole is braced by a guy anchored in the messenger wire of seven-strand, 7-16-in. Siemens-Martin cable is supported by Locke insulators secured toiron pins with Lehigh Portland cement. A two-bolt clampholds the pins to the bracket arm. Outside of towns andcities the trolley, which is of No. 000 grooved wire, is sus-. APPAIL\TUS .\XD WIRING IX THE MORTON SUB-STATION pended to the messenger at threepoints between poles, and, as the polesare set 140 ft. apart, this makes thedistance between supports 46 2-3 of municipal limits the numberof suspensions varies up to messenger has a deflection of 28ins., the trolley being 2 ins. belowit at the middle suspension. The trol-ley is staggered 7 ins. by varying thedistance from the center line of thetrack I in. at each bracket. At theextreme points a steady brace is em-ployed to hold the trolley the properdistance from the poles. These steadybraces, which are also used at curves,consist of a long maple insulator witha trolley clamp at the outer are bolted to the pole with anupward slope towards the pole toavoid possible interference with thetop contact of the pantograph each end of all curves and ontangents at ^-mile intervals the trol-ley is braced by short connectingguys attached at the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
