. The railroad and engineering journal . nced valve with stroke of 2 to. 4inches, according to position of governor and eccentric,a fly-wheel 50 inches in diameter, weighing 2,300 pounds,the steam and exhaust-pipes having diameters of 2>2 and4 inches, respectively, and the whole machine weighing2^ tons. The space occupied by the engine was 9 feet4 inches in length, by 4 feet 8 inches in width, and 3 feet10 inches in height. Examining the above table of powers, it is seen that thedifference between indicated and dynamometric power,the friction of the engine, varies somewhat, with varyingstea
. The railroad and engineering journal . nced valve with stroke of 2 to. 4inches, according to position of governor and eccentric,a fly-wheel 50 inches in diameter, weighing 2,300 pounds,the steam and exhaust-pipes having diameters of 2>2 and4 inches, respectively, and the whole machine weighing2^ tons. The space occupied by the engine was 9 feet4 inches in length, by 4 feet 8 inches in width, and 3 feet10 inches in height. Examining the above table of powers, it is seen that thedifference between indicated and dynamometric power,the friction of the engine, varies somewhat, with varyingsteam pressures and varying total power; but in suchmanner as to indicate the controlling cause to be irregularin action, and possibly to some extent due to errors ofobservation and to accident. The maximum is four horse-power, the minimum about two horse-power. The usualdifference is about three and the variations are irregularlydistributed throughout the whole range of is evident at a glance that the law of De fanibour does. the whole rated load on the engine (35 to 40 horse-power),and 231 when entirely unloaded, the brake-strap beingloosened until it could be shaken about on the pulley, bythe hand, with perfect ease. This was repeated until noquestion could longer exist in regard to the matter. Thevariation with variable steam pressure was greater. The following are the data obtained from the brake andindicator readings: .l-^ZI = 3-q 2-54 This engine was 8 inches ininches stroke of piston, having diameter of cylinder, 14a rod 44 inches long be- not hold, and that it is as nearly correct to say that thefriction of engine is constant as otherwise. The columnof friction, as given in percentages of the total power, ex-hibits the same fact. There is continual, though some-what irregular, reduction of the percentage of friction,throughout the range from the lowest to the highestpower, and very nearly inv
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
