File:The Street railway journal (1906) (14761169435).jpg

Identifier: streetrailwayjo271906newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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as well as the 4 ins. of exposedinsulation, is then wound with varnished cambric tape, ap-plied with Sterling varnish between the layers. It.is thencoated with insulating paint and wound all over with adhesivetape, including the whole surface of the lug, thus leavingonly the l)ond connections bare, and it then receives a finalcoat of insulating paint. The ends of the iron pipe are pluggedwitli oakum around the cable, to prevent dirt from enteringand to prevent movement of the cable in the )npc. Wherever these third-rail iinnpers are used to preserve thecontinuity of the regular third-rail system, they are made of cable exposed. 940 STREET RAILWAY JOURNAL. (Vol. XXVIL No. 24. sufficient size to carry as much current as the rail. For theloo-lb. special rail, which is equivalent to 1,650,000-circ. milcopper, 2,000,000-circ. mil cable is used, the additional areabeing allowed to compensate for the decreased radiating capa-city of the cables. For the 6o-lb. and 70-lb. third rails, 1,000,-
Text Appearing After Image:
FIG. 25.—lO-FT. BREAK IN THIRD RAIL OVER MANHOLE COVERS ON ATLANTIC AVENUE ooo-circ. mil cables were used under same conditions. For thesidings short lengths of third rail, which only have to supplyheavy currents momentarily, the size of the cable generallyused is 500,000 circ. mil. For a portion of the distance on Atlantic Avenue, the man- is made continuous by means of a cable jumper, similar tothat described above. THIRD-RAIL GUARD The Stillwell-Slater type of guard was adopted for thethird rail. It consists of yellow-pine plank, 1% ins. thick, 7 ins. wide, placed above the rail,with 2i/^-in. clear space betweenthe top of the rail and under sideof the plank. The edge of theplank nearest the track extends% in- beyond the line of the third-rail head, and is beveled back togive the necessary clearance forrunning equipment. Each plankhas a saw cut, ^ in. deep, in themiddle of the underside to pre-vent warping. The planks varyin length from 14 ft. to 16 ft.The guard is supported direc

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