. Train de locomotives : une revue pratique de la force motrice ferroviaire et du matériel roulant. Le poids du moteur—72,300 livres. Diamètre des vérins—15!4 pouces de tour. Cette distance a été dépassée très lentement, de sorte qu'il n'y ait pas de patinage.les marques de poinçon ont été définies comme avant etla piste marquée. Ensuite, la distance a été soigneusement mesurée avec une bande de vapeur de WC-pied, et la distance a été divisée par le nombre de révolutions que le conducteur avait madein la traversant. Ceci a donné à la cirfer-ence recherchée très précisément comme 15.8277 pieds.cette mesure a été vérifiée veryétroitement en exécutant un ruban autour d'un
1812 x 1379 px | 30,7 x 23,4 cm | 12,1 x 9,2 inches | 150dpi
Informations supplémentaires:
Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.
. Locomotive engineering : a practical journal of railway motive power and rolling stock . al weight of engine—72, 300 pounds. Diameter of cylinders—15!4 inches. revolutions. This distance was gone oververy slowly, so that there could be no slip.The punch marks were set as before andthe track marked. Then the distance wascarefully measured with a loo-foot steeltape, and the distance was divided by thenumber of revolutions the driver had madein traversing it. This gave the circumfer-ence sought very accurately as 15.8277 feet.This measurement was checked veryclosely by running a tape around one ofthe drivers. When the engine was drawn up in frontof the Ithaca station to leave, the rail wasmarked corresponding to the center of thewheel. When the train arrived at Owego, the wheel was set by trammel points andplumb line, and the track chisel-markedas at Ithaca. Then the final readings ofthe revolution counters were taken. Inmaking the return trip similar marks atOwego and Ithaca were taken as before.These marks, with the record of therevolution counters, proved that the driv-. TESTING SLIP OF DRIVING WHEELS. Length of stroke—33^ inches. Steam pressure—130 pounds. Total weight of cars hauled—95, 000pounds. The principal apparatus consisted oftwo Thompson indicators, two revolutioncounters and one Boyer speed recorder. To determine accurately the circumfer-ence of the drivers, the locomotive wasrun out on a long stretch of straight, leveltrack, where, by means of pinch bars, theengine was so set that a prick punch markon the driver was exactly one foot fromanother similar mark on the frame. Thesemarks were the same that were used forsetting the valves. Trammel points wereused to set the wheel accurately. Thena plumb line was dropped across the cen-ter of the driver, and the track wasmarked with a chisel to correspond. Theengine was then run forward seventy-four ers made precisely the same number ofrevolutions going and returning. Several trips were made, speed rate
