. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. Fig. 4. Iiead of 2^89 feet, and the following are some of the discharges obtained:â With a single tube, B -0444 cub. feet. With a tube, C, added -0329 â With three tubes, C â 0252 â With five tubes, C ^0202 â I have attempted to compare these results with those by the methods of calculation I have given: the differences have been sometimes great, sometimes inconsiderable; thus, for the last case I have had â 0185 cubic feet. 23. Notwithstanding the great irregularities which
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. Fig. 4. Iiead of 2^89 feet, and the following are some of the discharges obtained:â With a single tube, B -0444 cub. feet. With a tube, C, added -0329 â With three tubes, C â 0252 â With five tubes, C ^0202 â I have attempted to compare these results with those by the methods of calculation I have given: the differences have been sometimes great, sometimes inconsiderable; thus, for the last case I have had â 0185 cubic feet. 23. Notwithstanding the great irregularities which these results present, they are well worthy attention, and principally on account of the very striking manner in which they show the effect produced hy enlargements in a pipe; an effect, carried above a certain limit, altogether as prejudicial as that of contractions. Venturi's entire apparatus, which was 3^2 feet long, may be con- sidered as a pipe ^inch diameter, having the five enlargements C. It furnished, as we have seen, a discharge of ^0202 cub. feet. He afterwards, with a tube of the same length, but of the uniform diameter of 4-inch, obtained ^0327 cub. feet. The enlargements thus diminishing the discharge in the ratio of 100 to 62. 24. There is yet one other contraction that ought to be con S'deredâthat experienced by the fluid stream on its entry into a pipe of less diameter than that which immediately precedes it. The resistance arising from this contraction will evidently be the same as if, at the entry of the pi]ie, we had placed a plate pierced with an orifice of which the section should be to that of the pipe as 111 to 1 {in being the coefficient belonging to the contraction); and its expression will then be â¢02519 ^-7_L-l); DA m-2 J' This is a special case of the general formula (20), where B = D. The value of in can only be approximatively. For a very short pipe, as for cylindrical adjutages, it will be '82. But in pijies, jiroperly so called, it app
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