Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . 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 ou
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Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . 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 ports, sothat the admissionof steam is uni-form under all con-ditions of service.The valve, whichis of the pistontype, double andhollow, as shownin Fig. 124, con-trols the steam ad-mission and ex-. haust of both cyl-inders. The ex-haust steam fromthe high-pressurecylinder becomesthe supply steam for the low-pressure cylinder.As the supply steam for the high-pressure cylinder Figure 122