Stationary steam engines, simple and compound; especially as adapted to electric lighting purposes . fected by a governor of the classadopted in all engines of this kind, and the regulation andthe action of the valve are similar in character and in pre-cision to those seen in engines already described. The rangeof power, and the distribution of steam at various points ofcut-off, are shown very beautifully in the indicator diagramhere given, which was obtained by suddenly throwing off T-2 STEAM ENGINES FOR the load; each revolution gives a distinct card. Steammay follow from the beginning nearl
Stationary steam engines, simple and compound; especially as adapted to electric lighting purposes . fected by a governor of the classadopted in all engines of this kind, and the regulation andthe action of the valve are similar in character and in pre-cision to those seen in engines already described. The rangeof power, and the distribution of steam at various points ofcut-off, are shown very beautifully in the indicator diagramhere given, which was obtained by suddenly throwing off T-2 STEAM ENGINES FOR the load; each revolution gives a distinct card. Steammay follow from the beginning nearly to the end of stroke,with good exhaust and an excellent range of speed of engine was here 225. The card was taken byloading the engine to its maximum power by a Pronybrake, and then taking the diagrams while the governorwas adjusting the steam supply, the brake being at the mo-ment released. The smallest card is therefore a frictioncard. The smoothness of action of the regulating mech-anism is shown by the uniformity with which the power fallsoff and the cards diminish in Series of Indicator Diagrams.—Ide Engine. The next diagram shows the range of work which suchengines are capable of doing, and illustrates very finely thechange in the distribution of steam which takes place inthis accommodation of the power of the engine to its is seen that the compression, as well as the expansion,gradually changes in amount as the power varies, both act-ing to reduce the area of the diagram with diminishing ELECTRIC LIGHTING PLANTS. 153 power, or to increase it as the required power beccmesgreater. A very interesting effect of this change is to giveincreased economy in the use of steam by checking cylindercondensation, the greatest known source of waste of heat,just when that loss becomes most serious in both absolute
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectsteamen, bookyear1890
