Stationary steam engines, simple and compound; especially as adapted to light and power plants . edthrough the bearings by a pump. The bearings are thusforcibly deluged with oil, which returns to a reservoir. Thegovernor is a suction-fan mounted upon the spindle and con-nected with a diaphragm, which operates the throttle-valveagainst the power of a spring. Its action is found to berapid and certain. Such engines have been successfully employed in drivingelectric machinery and in spinning the fly of theHowell torpedo. For alternating electric currents this sys-tem possesses the peculiar advant
Stationary steam engines, simple and compound; especially as adapted to light and power plants . edthrough the bearings by a pump. The bearings are thusforcibly deluged with oil, which returns to a reservoir. Thegovernor is a suction-fan mounted upon the spindle and con-nected with a diaphragm, which operates the throttle-valveagainst the power of a spring. Its action is found to berapid and certain. Such engines have been successfully employed in drivingelectric machinery and in spinning the fly of theHowell torpedo. For alternating electric currents this sys-tem possesses the peculiar advantage of permitting a dy-namo to be employed having but two poles. It may bereadily driven continuously at speeds exceeding 10,000revolutions per minute, and, like the Dow turbine, elsewherereferred to, has been driven at 20,000 and upward. Withthe lower speeds of revolution usual with ordinary enginesthe number of poles required generally approximates thequotient 12,000 divided by the speed of engine, if directlyconnected. The best of these machines have demanded from 35 278 STEAM ENGINES FOR. ^sigf— ELECTRIC LIGHTING PLANTS. 279 pounds of steam per horse-power per hour upward, accord-ing to pressure employed. It may be assumed that theywill require not far from the weight where p^ lies between 50 and 200 pounds per square inchby gauge and the apparatus is operated under favorableconditions, the value of a lying between 350 and 400 withdry steam. In the United States the substitution of the Dow tur-bine for the systems previously in use, for torpedoes, hasbrought down the weight and volume of machinery fromthe earlier minimum of 360 pounds and three cubic feetper machine to 75 pounds and one cubic foot. In this turbine the steam enters through the passage eeand finds exit through/// to the exhaust-pipe g (page 280). The main shaft,/z/z, is carried on journals at each side thecasing, as seen, and a sleeve, //, stiffens the central part ofthe shaft and carries the turbine-wheels
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