. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . Fig. 194. — Interior View of Car Louisiana, Looking Toward the Rear from the Front Vestibule. ing mechanism, as well as some of the details of the movablevestibule guide frame. The counterweighting device for themovable vestibule is shown in the photograph, and consists ofa series of levers extending from the dynamometer support tothe roof of the car, the counterweight itself hanging on the endof the lever supported from the car roof. The end of the leveremployed in counterweighting the car
. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . Fig. 194. — Interior View of Car Louisiana, Looking Toward the Rear from the Front Vestibule. ing mechanism, as well as some of the details of the movablevestibule guide frame. The counterweighting device for themovable vestibule is shown in the photograph, and consists ofa series of levers extending from the dynamometer support tothe roof of the car, the counterweight itself hanging on the endof the lever supported from the car roof. The end of the leveremployed in counterweighting the car body is shown in theforeground and toward the right of the photograph. It con- 5S0 ELECTRIC RAILWAY TEST COMMISSION sisted essentially of a T shaped lever extending from thetrolley support toward the front of the car. At the end of thislever are seen cast-iron weights for producing the proper amountof Fig. 195, — Interior View of Car Louisiana, Looliing from the Center of theCar and Looliing Forward. The Calibration of the Dynamometers. A very considerable amount of time and attention was givento the general question of the calibration of the weighingmechanism. Various schemes for calibration were considered,and the one finally adopted is described below. It was decided that the most direct and reliable calibrationwould be obtained by means of Imown pressures exerted directly THE TEST CAR [LOUISIANA bdi Upon the vestibule and car body. The most convenient methodof obtaining variable direct pressures of this nature was by-means of a large bell-crank lever. Fig. 176 shows this leverin position for calibration with the Flat vestibule, which wasused in Test No. 60. This lever had a short arm of 18 a long arm of 9 ft. Three weights were employed in thecalibration. These weights consisted of pinion wheels takenfrom motor armatures, and weighing approximately 50 The e
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Keywords: ., bookauthorlouisian, bookcentury1900, bookdecade1900, bookyear1906
