. The Street railway journal . my of the two methods can beseen graphically from Figs. 2 and 3, which show the results atthe end of one acceleration period in a distance of 240 ft. withcar bodies of practically the same weight in each case. Thetwo-motor equipments reached a speed of 12 m. p. h., and thefour-motor equipment of m. p. h., while the cost of thefour-motor acceleration is half that of the two motors. In thiscase, with a 10-mile run and a 15-minute schedule, a four-motor- — EQUIPMENT 4-WEST. mean current demand. This car is operated over all routesand a constant is determined fo
. The Street railway journal . my of the two methods can beseen graphically from Figs. 2 and 3, which show the results atthe end of one acceleration period in a distance of 240 ft. withcar bodies of practically the same weight in each case. Thetwo-motor equipments reached a speed of 12 m. p. h., and thefour-motor equipment of m. p. h., while the cost of thefour-motor acceleration is half that of the two motors. In thiscase, with a 10-mile run and a 15-minute schedule, a four-motor- — EQUIPMENT 4-WEST. mean current demand. This car is operated over all routesand a constant is determined for each. The relation of theseconstants gives the relative duty required of the equipmentsover the different routes, and from these data the equipmentscan be placed to perform their best duty. Schedule speedscan then be altered to bring the same average duty on theequipments and reduce to a minimum the equipment deprecia-tion. Car electrical maintenance is determined by an electrical 68 MOTORS K6- CONTROLLER MULTIPLE ARMATURE. Strirt Ruibway Journal FIG 4.—GRAPHIC ILLUSTRATION OF THE RESISTANCE ON DIFFERENT POINTS OF SIXTY EQUIPMENTS.—THE RESISTANCEPOINTS SHOULD FALL ON THE DOTTED LINES FOR EACH STEP OF THE CONTROLLER equipment would show a marked saving over a two-motorequipment in both maintenance and power. In the graphicillustration the different losses in the equipment are shownwhere they occur, and are determined by autographic methods,which are instantaneous. These diagrams are the result ofthe averages of a number of different equipments of the sametype, and the weight and acceleration values are taken alongthe same track with the same motorman. The route constant is determined by operating over the routea number of times a calibrated equipment which follows a carin regular service so that the stops arc the same, as arc alsothe maximum speeds that are obtained and the maximum and inspection of the equipment. Measurements are taken with500 volts, and the results are
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
