. Locomotive engineering : a practical journal of railway motive power and rolling stock . ar car fittedwith roller bearings being let loose fromthe same point, ran the full length of thelevel line available—namely, 320 feet—andhad not then quite come to rest, the totaldistance traversed being 376 feet. Theforce expended was as above, 9,364 foot-pounds. The average frictional resist-ance was 9,364 -^ 376 = poumabout 9 pounds per ton of load. Tin- following figures are also of inter-est, and arc founded on the n ults ofactual experiments in tramway pr. trie Railway are ako experimenting in
. Locomotive engineering : a practical journal of railway motive power and rolling stock . ar car fittedwith roller bearings being let loose fromthe same point, ran the full length of thelevel line available—namely, 320 feet—andhad not then quite come to rest, the totaldistance traversed being 376 feet. Theforce expended was as above, 9,364 foot-pounds. The average frictional resist-ance was 9,364 -^ 376 = poumabout 9 pounds per ton of load. Tin- following figures are also of inter-est, and arc founded on the n ults ofactual experiments in tramway pr. trie Railway are ako experimenting inthis direction, and the Waterloo & CityRailway, a new line, is to be entirelyequipped with them. A passenger train of six cars has beenrunning between Brighton and KempTown for two years, and a saving of I2^ito 15 per cent, in fuel is reported. TheWestern Railway of France is also fittingUp a train for experimental purposes. These applications show that engineers the world over arc continually striving to vc the efficiency of the railway service, and all these experiments point. GREAT NORTHERN VESTIBULED TRAIN—BACK VIEW. Roller Bearings on Cars. An interesting paper on this subjectwas read before the English Institution ofCivil Engineers by William Bayley Mar-shall. As a result of the experiments, thefollowing figures are given as being per-fectly reliable: Starting Effect.—Cars weighing 4 tons15 cwt.; ordinary bearings, 198 pounds per ton; roller bearings,30 pounds, or pounds per ton. Running Friction.—Gravity test. A car fitted with ordinary bearings andweighing 2 tons 15 cwt. was let loose froma point 56 feet up an incline with I foot6J4 inches rise. It ran down this inclineand 57 feet along the level at foot of a total distance of 111 feet. The forceexpended was therefore 6,160 pounds fall-ing through feet, or 9,364 foot-pounds. The average frictional resistance Relative starting effort of a tramcar on agradient of 1 in 20—ordi
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Keywords: ., bookcentury1800, bookdecade1890, bookidlocomotiveen, bookyear1892
