The book Water And Water Supply was written by author Corfield William Henry Here you can read free online of Water And Water Supply book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Water And Water Supply a good or bad book?
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" Another plan is that described by Mr. Hawkesley, as follows : " The valve upon the main at Liverpool was divided into three openings, each of which was provided with a separate screen, so that by raising or lowering each of these slowly in succession the water was either admitted or turned off very gradually. The object of dividing the valve into three apertures was to enable a work- man to operate with facility on any one of the screws. In large pipes, where the pressure was great, it was ne...cessary, in order that the brass pieces, upon which 94 the valve acted, might not be abraded, that only a certain amount of pressure should be put upon them, and that the friction under that pressure should not be greater than a man could overcome, by simply turning a handle, without stripping the thread of the screw. As a further provision the center valve was made very narrow ; the side valves were first closed and then the center one, so that concussion was prevented. In ad- dition there were branches at various points, upon which equilibrium valves, with a piston underneath, were placed, and others had double beat valves.
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