. Ingegneria locomotiva : una rivista pratica di energia motrice ferroviaria e materiale rotabile. Peso al del motore: 72,300 libbre. Diametro dei cilindri: 15!4 pollici. Giri. Questa distanza è stata percorsa troppo lentamente, in modo che non ci poteva essere slittamento.i segni di punzonatura sono stati impostati come prima ela traccia marcata. Poi la distanza misurata wasattentamente con un nastro di acciaio di loo-piede, e la distanza è stata divisa da qualcun numero di giri che il conducente ha fatto attraversare madein esso. Ciò ha dato la circumfer-ence cercata molto precisamente come 15.8277 piedi. Questa misura è stata controllata veryrenthy facendo funzionare un nastro intorno ad uno
1812 x 1379 px | 30,7 x 23,4 cm | 12,1 x 9,2 inches | 150dpi
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. 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
