Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . ach side, the ratio ofthe volumes being as nearly three to one as the em-ployment of convenient measurements will are cast in one piece with the valve-chamber andsaddle, the cylinders being in the same vertical plane,and as close together as they can be with adequatewalls between them. Where the front rails of the frames are single bars,the high-pressure cylinder is usually put on top, asshown in Fig 120, but when the front
Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . ach side, the ratio ofthe volumes being as nearly three to one as the em-ployment of convenient measurements will are cast in one piece with the valve-chamber andsaddle, the cylinders being in the same vertical plane,and as close together as they can be with adequatewalls between them. Where the front rails of the frames are single bars,the high-pressure cylinder is usually put on top, asshown in Fig 120, but when the front rails of framesare double, the low-pressure cylinder is usually ontop, as shown in Fig. 121. The former (Fig. 120) is used in eight-wheel Of 264 LOCOMOTIVE ENGINEERING American type passenger locomotives, and in ten-wheeled locomotives, while the latter (Fig. 121) isused in Mogul, Consolidation and Decapod locomo-tives; for the various other classes of locomotives themost suitable arrangement is determined by the styleof frames. |. Fig. 122 shows the arrangement of the cylinders inrelation to the valve. r The valve employed to distribute the steam to the. Figure 120 Figure 121 cylinders is of the piston type, working in a cylin-drical steam-chest located in the saddle of the cylindercasting between the cylinders and the smoke-box, andas close to the cylinders as convenience will permit. As the steam-chest must have the necessary steampassages cast in it and dressed accurately to therequired sizes, the main passages in the cylinder cast-ing leading thereto are cast wider than the finishedports. The steam-chest is bored out enough largerthan the diameter of the valve to permit the use of ahard cast iron bushing (Fig. 123). This bushing isforced into the steam-chest under such pressure as t<prevent the escape of steam from one steam passag< COMPOUND LOCOMOTIVES 265 to another except by the action of the valve. Thusan opportunity is given to machine accurately all thevarious
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlocomot, bookyear1916
