. Revised and enlarged ed. of the science of railways . DESCRIPTION OF LOCOMOTIVE. 95 much as possible. Besides the usual air valvesplaced iu the main passage of the high-pres-sure C5^1inder and also in the admission ports ofthe low-pressure cylinder, additional air-valvesare placed in the low-pressure cylinders toprevent theformationof a vacu-um whichwould drawcinders intothe steam-chest preventrupture incase of ex-cessive pres-sure, waterrelief valvesare attachedto the front and back cylinder heads of the low-pressure cyl-inder. The compound engine is generally similarto the
. Revised and enlarged ed. of the science of railways . DESCRIPTION OF LOCOMOTIVE. 95 much as possible. Besides the usual air valvesplaced iu the main passage of the high-pres-sure C5^1inder and also in the admission ports ofthe low-pressure cylinder, additional air-valvesare placed in the low-pressure cylinders toprevent theformationof a vacu-um whichwould drawcinders intothe steam-chest preventrupture incase of ex-cessive pres-sure, waterrelief valvesare attachedto the front and back cylinder heads of the low-pressure cyl-inder. The compound engine is generally similarto the ordinary single-expansion locomotive, ex-cept in the respects pointed out.* The grate of a locomotive usually consists ofcast iron bars so arranged that they may beeasily moved or shaken. Grates designed for *The subject of compound-cylinder engines rcrsw-s single-expansion cylinder engines is also referred to in the chapter on The Evolution of the LocomoTive in this Application of Starting Valve and Relief Cock,Compound Cylinder. 96 RAIL ^yA y eq uipment.
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