Minutes of Proceedings of the Institution of Civil Engineers, Vol. 104: With Other Selected and Abstracted Papers (Classic Reprint)

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Excerpt from Minutes of Proceedings of the Institution of Civil Engineers, Vol. 104: With Other Selected and Abstracted PapersThen followed the oscillating and the horizontal engines, and these were the principal forms of marine engine in vogue up to the year 1860, both having low-pressure steam, scarcely ever reaching 50 lbs. Per square inch. Later on the fact was recog nized that high-pressure steam was more suitable and economical, and probably the Paper read before the Institution by Mr. Alfred Holt, in had considerable in¿uence on the minds Of marine engineers. Since the before-mentioned date the overhead form of compound engine, with initial pressures of from 80 to 100 lbs. And expanding either in two or in three cylinders, has been adopted, and from about the year 1884 to the present time the triple-expansion engine has been the accepted form.With higher pressures came the necessity for a surface-condenser, and. Thus began the separation Of the condensing-plant and the introduction of circulating-engines. Now, most large main engines consist simply of the cylinder frame-work and ordinary working parts, the air-pump, circulating-pump, reversing-engine, feed pump, and the turning-engines, being entirely separate from the main engines. The advantages which this arrangement possesses are manifest, as it would be almost impossible to construct large engines such as are now made, running at from 850 to 900 feet piston-speed per minute, and occupying such small compass, unless the condensing-power were separate.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.