. Electric railway journal . sings areprovided by bending the rail to form a 4-ft. inclinewith a total rise of 3 in. The third-rail is drilled withone hole at each end to serve for bolting the malleable-iron fish plates, these being so designed as to produceno strain or unusual friction and being slotted to al-low for expansion. The third-rail rests on malleable-iron castings, which in turn dowel to the S^-in. two-petticoat, two-piece insulators. These insulators weretested at 5000 volts. They are held in place on theties by a square, malleable lug, which is fastened witha lag screw and fits i
. Electric railway journal . sings areprovided by bending the rail to form a 4-ft. inclinewith a total rise of 3 in. The third-rail is drilled withone hole at each end to serve for bolting the malleable-iron fish plates, these being so designed as to produceno strain or unusual friction and being slotted to al-low for expansion. The third-rail rests on malleable-iron castings, which in turn dowel to the S^-in. two-petticoat, two-piece insulators. These insulators weretested at 5000 volts. They are held in place on theties by a square, malleable lug, which is fastened witha lag screw and fits into a recess in the insulator dimensions of the cap casting are such as to pre-vent free longitudinal movement of the on this casting, 1 3/16 in. high, keep the railfrom shifting out of line. Third-rail joints are bondedwith 7-in. 500,000-circ. mil. bonds of the copper-ribboncompressed-terminal type furnished by the ElectricService Supplies Company. On industrial sidings and passing tracks the third-. MICHIGAN 2400-VOLT LINE—VIEW SHOWING THIRD-RAILBEFORE INSTALLATION OF GUARDS. TELE-PHONE JACK BOX AT LEFT June 19, 1915] ELECTRIC RAILWAY JOURNAL 1147 rail insulator is the same as that on the main line, butthe third-rail is of 52-lb. weight. To obtain the samehorizontal and vertical clearance as that for the maintrack third-rail, special malleable-iron cap castingswere employed. The third-rail at these points is bondedwith 250,000-circ. mil bonds of the same type as thoseused on the main track. The third-rail is guarded on both sides to afford pro-tection to men working on the track. The guard onthe track side is a 1-in. x 8-in. fir board, the top ofwhich is level with the third-rail. The guard on theoutside is 1 in. x 10 in. in size, and the top is 2 In this position these guards prevent a baror any other piece of metal which may drop acrossthe third-rail from coming in contact with it. Theguard boards are 16-ft. long and are fastened togeth
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
