. The Street railway journal . tion, it FIG. 6.—TYPE OF FOUR MOTOR CAR TESTED unfortunately it is not a high-torque meter, and cannotbe used in connection with a contact device. In the tests made, the Thomson recording wattmeter wasmounted upon a spring-supported board to lessen the vibra-tion. A modified form of contact maker was also usedin these tests. It consisted of placing a sheet of fiber 1/16in. in thickness and 4 ins. in length one-half way roundthe motor axle, and fastening it there with copper flat spring brush, as shown in Fig. 5, was then allowedto press against the axle, m
. The Street railway journal . tion, it FIG. 6.—TYPE OF FOUR MOTOR CAR TESTED unfortunately it is not a high-torque meter, and cannotbe used in connection with a contact device. In the tests made, the Thomson recording wattmeter wasmounted upon a spring-supported board to lessen the vibra-tion. A modified form of contact maker was also usedin these tests. It consisted of placing a sheet of fiber 1/16in. in thickness and 4 ins. in length one-half way roundthe motor axle, and fastening it there with copper flat spring brush, as shown in Fig. 5, was then allowedto press against the axle, making contact for each revolu-tion. The brush was mounted upon a piece of wood whichcould be quickly fitted into a ring on the motor frame, asshown in the figure. Leads were brought up from the con-tact brush and connected in series with a battery, the wheelrevolutions relay and the grounded car body. OBJECT OF TESTSThe object of the tests, performed through the courtesyof J. F. Calderwood, of the Brooklyn Rapid Transit Com-. FIG. 7.—RECORDER MOUNTED DURING TEST pany, was to obtain a series of values of energy consump-tion for trolley cars, as operated under various conditionsof initial acceleration, various schedules and various ratesof braking. To obtain values which were comparative, the 288 STREET RAILWAY JOURNAL. [Vol. XXX. No. 8. same motorman and the same conductor was used in everycase. The rate of notching up of the controller and thedistances to be run were controlled by the same man. Carswere selected of the latest type of four-motor equipment, asshown in Fig. 6. The testing apparatus was mounted inthe front of the car, as shown in Fig. 7, and the records ofcurrent, voltage, wheel revolutions, revolutions of watt-meter disc, time and instantaneous speed were obtained as EFFECTIVE PARK ADVERTISING IN THE TWIN CITIES
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
