. Appleton's dictionary of machines, mechanics, engine-work, and engineering. he right or left being to expand or approximate thetwo cut-off slides by the right and left screws, and thus increase or diminish the degree of expansionwithout affecting the lead. The cylindrical, or piston-valve chest, has three valves S T and U, on thesame rod V; and, as represented in the horizontal section, the engine is upon its bottom centre, andsteam is entering between the valves U and T; the valve U being on the point of opening to admitsteam to the cylinder—the waste steam of the previous stroke having esc

. Appleton's dictionary of machines, mechanics, engine-work, and engineering. he right or left being to expand or approximate thetwo cut-off slides by the right and left screws, and thus increase or diminish the degree of expansionwithout affecting the lead. The cylindrical, or piston-valve chest, has three valves S T and U, on thesame rod V; and, as represented in the horizontal section, the engine is upon its bottom centre, andsteam is entering between the valves U and T; the valve U being on the point of opening to admitsteam to the cylinder—the waste steam of the previous stroke having esc Stock Photo
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The Reading Room / Alamy Stock Photo

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2AGE2H2

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7.2 MB (448.3 KB Compressed download)

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1998 x 1251 px | 33.8 x 21.2 cm | 13.3 x 8.3 inches | 150dpi

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. Appleton's dictionary of machines, mechanics, engine-work, and engineering. he right or left being to expand or approximate thetwo cut-off slides by the right and left screws, and thus increase or diminish the degree of expansionwithout affecting the lead. The cylindrical, or piston-valve chest, has three valves S T and U, on thesame rod V; and, as represented in the horizontal section, the engine is upon its bottom centre, andsteam is entering between the valves U and T; the valve U being on the point of opening to admitsteam to the cylinder—the waste steam of the previous stroke having escaped by the opening cast inthe middle of the cylinder, and through similar recesses formed in the valve T, into the blast-pipe W.Now it is to be remembered that the valve U must travel downwards until its port leading into the cyl- MARINE STEAM ENGINE. 357 inder is full open; and, as the whole three valves are on one rod, as U is opening to admit steam to thecylinder, T is closing the communication hetween the cylinder and the hlast-pipe. So soon as the ports g ???. Scale 4 feet to 1 inch. to the blast-pipe—which are only half the width of the valve—are closed, the other valve S opens, andthe remaining vapor escapes through the pipes X, cast on the steam-chest, to the pipe Y, leading to thecondenser Z. As the expansion at each stroke commences at the face of the cut-off slides, whateveramount of steam may be in the piston-valve chest at the time is also expanded ; therefore, to diminishthis amount as much as possible, two additional pistons S S, are fitted upon the valve-rod, for the pur-

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