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Excerpt from Journal of the Franklin Institute of the State of Pennsylvania, for the Promotion of the Mechanic Arts, Vol. 45: Devoted to Mechanical and Physical Science, Civil Engineering, the Arts and Manufacture; January-June, 1863 The valve motion is controlled by a single or double plug-rod, from the beam, which is provided with tappets to operate the valve levers, and the cataract lever. The cataract is a very simple and beautiful arrangement by which a small weighted pump plunger, when lifted by the rod, is regulated in its time of descent by throttling its discharge orifice, and opens the exhaust and steam valves for the return stroke by means of certain rods, levers, and cams, at a given point, thereby determining the number of strokes in a given time. This motion, as a whole, is effective and easily adjustable, but somewhat cumbrous and noisy, and is necessarily automatic, from the absence of eccentrics and rotary motions. Four valves are used, all of which are of the double-beat or ba lanced form, viz: the governor valve which throttles the admission of steam to the steam chest, and works close to the steam-valve so as to prevent any material collection of steam at full pressure, between them; the steam-valve, which Operates in the usual way the exhaust valve, which Opens in advance of the steam-valve at the base of the cylinder; and the equilibrium valve, which provides for the counter weight return stroke by connecting the lower side of the piston with the upper, so as to produce a balance of pressure. The lap and lead given this valve at will regulates the amount of cushion for the upper and lower piston stroke. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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