Journal Franklin Institute of the State of Pennsylvania, 1832, Vol. 10 (Classic Reprint)

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Excerpt from Journal Franklin Institute of the State of Pennsylvania, 1832, Vol. 10 The figures just referred to, are given because they represent this valve more in detail than the plate formerly given. In the plan of the valve, as first described, the liquid was suffered to run over the edge of the outer vessel. Now a rim, f, is added, from which a pipe, g, (fig. 5) conveys the surplus fluid into the receiver below. This pipe passes down behind the graduated plate shown in fig. 4. The cocks figured in the former plate are dispensed with. The tension of steam indicated by the plate, (see fig. 4) is 50, the surface of the fluid being at that height in the glass tube, and consequently the same in the outer vessel. The rim of the outer vessel is bolted to the steam pipes, to prevent the apparatus from being raised, thus preventing the valve from opening. It has been suggested that the evaporation of the fluid in the outer vessel, would require a constant supply. This supply is abundantly furnished by portions of condensed steam frequently oozing through the valve. (See remarks on the valve, p. 69 of the last volume.) Should mercury, instead of water, be used, the hydrostatic apparatus should be made of cast iron, and turned smooth, the rim on the outer vessel being made capacious enough to receive the surplus fluid expelled by the opening of the valve. The size of the whole would scarcely exceed one-twelfth of that for water. No cocks in the outer vessel would be required. I have a plan and drawings of one, (including the gauge, ) for mercury, but as it has not yet been put in practice, I need not describe it. 3d. Deficiency of water. - This is directly and indirectly, perhaps, the most frequent source of the injury and of the explosion of boilers. Many boilers have been caused to leak, and others have been rendered useless by being overheated and burned, while little or no water was in them, although no explosion was produced. 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.