Hydraulic Tables, Coefficients & Formulae: For Finding the Discharge of Water from Orifices, Notches, Weirs, Pipes & Rivers

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Weale, 1861 - 455페이지
 

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445 페이지 - CUBIC MEASURE 1728 cubic inches = 1 cubic foot 27 cubic feet = 1 cubic yard...
124 페이지 - HJ, where Q is the quantity of water in cubic feet per minute, and H the head as measured vertically in inches from the still water level of the pool down to the vertex of the notch. This formula is submitted at present temporarily, as being accurate enough for use for ordinary practical purposes, for the measurement of water by notches similar to the one experimented on, and for quantities of water limited to nearly the same range as those in the experiments ; but as being, of course, subject to...
119 페이지 - ... for many purposes suitable and convenient. They are, however, but ill adapted for the measurement of very variable quantities of water, such as commonly occur to the engineer to be gauged in rivers and streams.
372 페이지 - ... the effect, therefore, of overshot wheels, under the same circumstances of quantity and fall, is at a medium double to that of the undershot : and, as a consequence thereof, that non-elastic bodies, when acting by their impulse or collision, communicate only a part of their original power ; the other part being spent in changing their figure, in consequence of the stroke. The powers of water, computed from the height of the wheel...
121 페이지 - ... and laterally, so as to form a bottom to the channel of approach, which will both be smooth and will serve as the lower bounding surface of a passage of approach, unchanging in form, while increasing in magnitude at the places, at least, which are adjacent to the vertex of the notch. The floor may...
123 페이지 - ... water above the vertex of the notch, I would anticipate that the quantities flowing would still be, approximately at least, proportional to the £-power of the head as before ; and a set of coefficients would have to be determined experimentally for different ratios of the height of the head water to the height of the tail water above the vertex of the notch.
121 페이지 - In the notches now proposed, of triangular form, the influence of the bottom may be rendered definite, and such as to affect alike (or, at least, by some law that may be readily determined by experiment) the flow of the water when very small, or very great, in the same notch.
380 페이지 - ... velocity of the circumference is made the same as the velocity of the entering water, and thus there is no impact between the water and the wheel ; but, on the contrary, the water enters the radiating conduits of the wheel gently, that is to say, with scarcely any motion in relation to their mouths. In order to attain the equalization of these velocities, it is necessary that the circumference of the wheel should move with the velocity which a heavy body would attain in falling through a vertical...
233 페이지 - ... Neville's rule in this way : " Describe any circle on the drawing board; draw the diameter and produce it on both sides ; draw a tangent to the lower circumference parallel to this diameter, and then draw side slopes at the given inclinations, touching the circumference on each side and terminating in the parallel lines. The trapezoid thus formed will be the best form of channel, and the width at the surface will be equal to the sum of the two side slopes.

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