. The Street railway journal . Per cent Carbon, not to exceed 12 Manganese, not to exceed. . 15Phosphorus, not to exceed. ... 10Sulphur, not to exceed 05 The electrical conductivity of a thirdrail of this composition will be about 60per cent higher than that of an ordinaryrunning rail of the same cross section; thatis, a third rail of this special compositionwould weigh only 63 per cent of a trackrail of ordinary composition for the sameconductivity, and would have about the resistance of copper. The third-rail insulator here shown isa block of wood or vitreous material witha slot in
. The Street railway journal . Per cent Carbon, not to exceed 12 Manganese, not to exceed. . 15Phosphorus, not to exceed. ... 10Sulphur, not to exceed 05 The electrical conductivity of a thirdrail of this composition will be about 60per cent higher than that of an ordinaryrunning rail of the same cross section; thatis, a third rail of this special compositionwould weigh only 63 per cent of a trackrail of ordinary composition for the sameconductivity, and would have about the resistance of copper. The third-rail insulator here shown isa block of wood or vitreous material witha slot in the top into which the third rail islaid, no clamps or bolts being required to bold the rail inplace. The third-rail shoe used with this form of protected STREET RAILWAY JOURNAL. [Vol. XX. No. 5. third rail is a plate of cast-iron hinged at the point of sup-port and carried by brackets adjustable for height to allowfor wear of the wheels. These brackets are bolted to aninsulating timber attached to the truck journal boxes. A. L Mjj|llJi ls V*!<|HJ< Track Rail =Guard Cha 1—IK—/R 1:, U U, 30 ft. Lengths 30 ft. or 60 £t. „uel=29 ft. 11H Ungths SUGGESTED HEIGHT OF RAIL AND GUARD, AND SPACING OF SUPPORTS guard or protection of wood may be placed over the shoeand support, preventing accidental contact with the shoeun the side opposite the third rail. This form of protected third rail as installed on the yardand tracks of the General Electric Railroad has been oper-ated with marked success during the last winter, with less rail or wire may be installed overhead, a length of 50 generally sufficient. Current from this overheadsection may be collected by a low pantagraph shoe mountedon top of the car. The location of the third rail with refer-ence to the track rails is a detail de-serving careful consideration. Uniform-ity in this respect is as desirable as anystandard, particularly if cars of differentcompanies are likely to operate over eachothers lines.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
