. The Street railway journal . m the trolley to an alternating September 30, 1905.] STREET RAILWAY JOURNAL. 58i current. The current in the primary coils of the welder is 300alternating, 40 cycles. The direct current side of the rotary willtake current from 325 to 600 volts from the trolley, and by means ofsuitable regulating apparatus the output on the alternating side, tothe welder, is kept practically constant at 300 volts, without regardto the fluctuations on the line. On a line voltage of 500, about 225amps, are required, or it takes about 125-kw to make a weld, thecurrent being on about
. The Street railway journal . m the trolley to an alternating September 30, 1905.] STREET RAILWAY JOURNAL. 58i current. The current in the primary coils of the welder is 300alternating, 40 cycles. The direct current side of the rotary willtake current from 325 to 600 volts from the trolley, and by means ofsuitable regulating apparatus the output on the alternating side, tothe welder, is kept practically constant at 300 volts, without regardto the fluctuations on the line. On a line voltage of 500, about 225amps, are required, or it takes about 125-kw to make a weld, thecurrent being on about two and a half minutes to each weld. The third and last operation in the process consists in grindingthe head of the rail to a true surface. In welding new rail there islittle need for this tool. In old track, where the rail ends havebeen battered, the receivirig rail is purposely welded higher than theother. The grinder is then used to grind out the inequalities inthe rail head and bring it back to a true surface. The grinder. FIG. AFTER BEING CLEANED, MILWAUKEE consists of an emery wheel mounted on a carriage having tworollers, which are about 4 ft. apart. This carriage is let down onthe rail so that the rollers roll along the head of the rail, theemery wheel being over the uneven portion at the joint. The car-riage is connected with a motor on the car by a swing frame, thusenabling the operator to move the emery wheel back and forth overthe joint while the car remains stationary. By means of a handwheel the emery wheel is gradually fed down, and as it is movedforward and back grinds off the high places until the whole jointis brought to a true surface. The principle is very much the sameas a carpenters plane. With the final operation of grinding thejoint is left complete. Carried on as a continuous process, it takes from 12 to 15 min-utes to complete a joint. The work is carried on day and night.
Size: 2028px × 1233px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
