. American engineer and railroad journal . storage tank of ample capacity. The air compres-sor can be operated by hand to charge the tank for the first time,after which it is run by a belt from any convenient pulley eitheron the engine itself or on the shafting. By running the compres-sor a few minutes every day the tank is kept fully charged andready for starting the engine at any time. A pipe leads from theair tank to one cylinder of the engine, in which pipe is a valvearranged to be opened and closed at each revolution of the engine,by means of a cam on the end of the shaft which operates t
. American engineer and railroad journal . storage tank of ample capacity. The air compres-sor can be operated by hand to charge the tank for the first time,after which it is run by a belt from any convenient pulley eitheron the engine itself or on the shafting. By running the compres-sor a few minutes every day the tank is kept fully charged andready for starting the engine at any time. A pipe leads from theair tank to one cylinder of the engine, in which pipe is a valvearranged to be opened and closed at each revolution of the engine,by means of a cam on the end of the shaft which operates theexhaust valves, the opening occurring just as the crank is pass-ing its upper center. A single motion of a lever on the crankcase sets the exhaust valve on this cylinder so that it opens onevery return stroke of the piston, instead of every other stroke,as when the engine is in normal operation. A turn of a screwthrows the admission valve on the same cylinder out of opera-tion. It will readily be seen that one cylinder of the engine is. Front View of 70 Horse-Power Westinehouse Gas Engine. height, from the base of [the engine to the center of the shaft,is a specially desirable feature where the engine is connecteddirect to an electric generator or other machine. The ignition of the explosive mixture is accomplished by theelectric spark. The igniters are simple in construction and ex-ceedingly durable. They are mounted in small castings, easilyremoved and replaced. In sizes from 13 horse-power up doubleigniters are provided in each cylinder. One igniter only in eachcylinder is in operation at any one time, the other being held inreserve. Small gts engines are easily set in operation by giving the fly-wheel several turns by hand until a charge of gas and air hasbeen drawn in, compressed and exploded. In the larger sizesthis method is too laborious, requiring the combined efforts ofseveral men, besides being attended with more or less dangerfrom the sudden starting when explosio
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
