This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1844 edition. Excerpt: ...engineer. The operation of the machine is as follows: the steam being generated in great abundance in the boiler, and being unable to escape out of it, acquires a considerable degree of elastic force. If at that moment the cock V is opened, by the handle II, the steam penetrating into the tube S at the top, near X, and in the direction of the arrows, passes through the tube and the valve V, and enters the valve box t. There a sliding valve o o, which moves at the same time with the machine, opens for the steam a communication successively with each end of the cylinder. Thus, in the figure, the entrance on the left hand of the sliding valve is represented as being open, and the steam follows in the direction of the dotted line into the cylinder, where its expansive force will move the piston P in the direction of the arrow. The steam or air on the other side of the piston passes out in the direction of the dotted line to u, which communicates with the tube t t, from which it passes into the chimney C, and thence into the open air. The sliding valve o o now moves and leaves the right hand aperture open, while it closes the one on the left. The steam then drives the piston back, and that portion of the steam on the left of the piston, having performed its office, passes out of the aperture u, an opening to which is made by the new position of the sliding valve. Thus, the sliding valve opening a communication, alternately, with each side of the piston, the steam is admitted on both sides of the piston, and having performed its office, it passes through the aperture u to the tube t1, and the chimney C, and from thence into the open air. Motion being thus given to the piston, it is communicated, by This cock is not seen in the figure, because...
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