Hydraulic Manual, المجلدات 1-2

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W.H. Allen & Company, 1875 - 446 من الصفحات

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الصفحة 55 - ... although one clause of a sentence in it, read by itself, might be supposed to do so. The passage is to be found in their work at p. 286. They begin by saying, that their experimental observations detailed in their previous pages " prove that even in a perfectly calm day there is a strong resistance to the motion of the water at the surface as well as at the bottom," and that this resistance at the surface " is not wholly or even mainly caused by friction against the air.
الصفحة 5 - ... orifice. In the construction of water works, it is customary to conduct the stream, or such a part of it as is required, into a cubical cistern, and to let it issue from the side of this, near to the bottom, and thus fall upon the main wheel.
الصفحة 14 - The rise of ordinary floods is from 5 to 7 feet in 24 hours only, and the maximum is 50 feet above coldweather level.
الصفحة lxvii - ... rivers and canals in bad order and regimen, overgrown with vegetation and strewn with stones or detritus of any sort.
الصفحة 91 - ... weirs, and escapes, yielding a revenue of £1 500 000, and having a capital sunk in them of 15 millions sterling ; yet in 1853 not one new tank had been made by the English, while a very large proportion of them had been allowed to fall into disrepair. The Viranam tank, a very ancient work, in Tanjor, has an area of 35 square miles, and an embankment 12 miles long; it is still in full operation, and secures an annual revenue of £ll 453.
الصفحة 148 - Diameters of plug -0o •0585 -0912 •1211 •1374 Depths from water surface 1 •26 1-90 2-71 3-71 Diameters of plug -1480 •1554 •1610 -1653 The principle being that the velocity of discharge through an orifice varies with the square foot of the head of water ; thus, taking R r to represent the radii of the orifice and plug respectively, the discharge per second H being the head of water, the value of the experimental coefficient, o, being for this case deduced, from a series of experiments...

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