. Revised and enlarged ed. of the science of railways . e high-pressure) it is convej^ed into a liirger cylinder(the low-pressure), where it expands and actsagain upon another piston before being finallj^exhausted through the smokestack. The four-cylinder compound locomotive has a high-pres-sure and low-pressure cylinder on each side ofthe engine. The two cylinders (high and lowpressure) of the type illustrated, are cast in onepiece, with a valve chamber and saddle. Thevalve which allows the steam access to the cylin-ders is of the piston type. It is double and hol-low and works in a cylindric
. Revised and enlarged ed. of the science of railways . e high-pressure) it is convej^ed into a liirger cylinder(the low-pressure), where it expands and actsagain upon another piston before being finallj^exhausted through the smokestack. The four-cylinder compound locomotive has a high-pres-sure and low-pressure cylinder on each side ofthe engine. The two cylinders (high and lowpressure) of the type illustrated, are cast in onepiece, with a valve chamber and saddle. Thevalve which allows the steam access to the cylin-ders is of the piston type. It is double and hol-low and works in a cylindrical steam chest inthe saddle of the cylinder casting, between thecylinders and the smoke box. This valve con-trols the steam ad-mission and ex-haust of both thehigh and low-pres-sure steam whichis exhausted fromthe high-pressurecylinder becomesat once the supplyfor the low-pres-sure the frontbars of the locomotive frames are double, thelow-pressure cylinder is placed on top, as thedouble rail prevents the use of the ordinary. Front View of Compound Cylinder (cylinderheads removed). 94 RAILWAY EQUIPMENT. rock shaft and box. The valve motion is thenwhat is called direct acting, changing the loca-tion of the eccentrics on the axle in relation tothe crank pin. When the front rails are singlebars, the low-pressure cylinder is under the otherand the eccentrics are placed in the usual posi-tion. In such case the valve motion is calledindirect acting. The most common method oftransferring the motion from the links to thevalve rod is by means of a rocker arm, the linkblock being connected with the lower end of therocker arm, and the valve rod to the upper starting the locomotive, steam is admittedto both the low and high-pressure this purpose a starting valve is provided,which is opened to admit steam to pass from one end of the high-pressure cylinderto the other, andthence through theexhaust to the low-pressure is operated
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