. The principles of physics. e cylinder C, and thus admits the steamalternately each side of the piston P. When one of thesepassages is open, the other is always closed. Though thepassage between the valve-chest and the space in the cylinderon one side of the piston is closed, thereby preventing theentrance of steam into this space, the passage leading fromthe same space is open through the interior of the valve, sothat steam can escape from this space through the exhaust-pipe E. Thus, in the position of the valve represented in thediagram, the passage N is open, and steam entering the cylin-
. The principles of physics. e cylinder C, and thus admits the steamalternately each side of the piston P. When one of thesepassages is open, the other is always closed. Though thepassage between the valve-chest and the space in the cylinderon one side of the piston is closed, thereby preventing theentrance of steam into this space, the passage leading fromthe same space is open through the interior of the valve, sothat steam can escape from this space through the exhaust-pipe E. Thus, in the position of the valve represented in thediagram, the passage N is open, and steam entering the cylin- DESCRIPTION OF A STEAM-ENGINE. 309 der at the top drives the piston in the direction indicated bythe arrow. At the same time the steam on the other side ofthe piston escapes through the passage M and the exhaust-pipe E. While the piston moves to the left, the valve movesto the right, and eventually closes the passage N leadingfrom the valve-chest and opens the passage M into the same,and thus the order of things is Fig. 222. Motion is communicated by the piston through the piston-rod E to the crank G, and by this means the shaft A isrotated. Connected with the shaft by means of the crank His a rod B, which connects with the valve V, so that, as theshaft rotates, the valve for the greater part of its stroke ismade to slide to and fro, in a direction opposite to that ofthe motion of the piston. 310 MOLECULAB. DYNAMICS. The shaft carries a fly-wheel, W. This is a large, heavywheel, having the larger portion of its mass located nearits circumference; it serves as a reservoir of energy, whichis needed to make the rotation of the shaft and all othermachinery connected with it uniform, so that sudden changesof velocity resulting from sudden changes of the drivingpower or resistances may be avoided. By means of a beltpassing over the wheel W motion may be communicatedfrom the shaft to any machinery desirable. 268. Condensing and non^eondensing-engines} — Sometimessteam, af
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1895
