Lowell Hydraulic Experiments, Being a Selection from Experiments on Hydraulic Motors, on the Flow of Water Over Weirs, and in Canals of Uniform Rectangular Section and of Short Length: Made at Lowell, Massachusetts
Lowell Hydraulic Experiments, Being a Selection from Experiments on Hydraulic Motors, on the Flow of Water Over Weirs, and in Canals of Uniform Rectangular Section and of Short Length: Made at Lowell, Massachusetts
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1835 Excerpt: ... 30, we have, by table VI., the total quantity discharged = 112.996 cubic feet per second, and as there are forty orifices, we have q, _ 119% = 2.8249. 40 In figure 2, plate IX., the buckets and guides are drawn to a scale one fourth the full size;--the radius of the arc AB = R = 56.028 inches. To find the limit of the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1835 Excerpt: ... 30, we have, by table VI., the total quantity discharged = 112.996 cubic feet per second, and as there are forty orifices, we have q, _ 119% = 2.8249. 40 In figure 2, plate IX., the buckets and guides are drawn to a scale one fourth the full size;--the radius of the arc AB = R = 56.028 inches. To find the limit of the stream on the side B C, the arcs IF, KH, etc., N C, are drawn with the radii 55 inches, 54 inches, etc., 47.922 inches;--the arcs EF, GH, etc., 0 C, being taken from column 10, equal to 0.415 feet, 0.796 feet, etc., 2.748 feet; the points B, F, H, etc., C, being connected by suitable-lines, determine the limit of the stream on that 6ide. The limit of the stream on the other side is found by making the arcs FL = EI, HM--G K, etc., CD = ON;--the points A, L, M, etc., D, being connected by suitable lines, determine the limit of the stream on that side. By an examination of figure 2, it will be seen, that the section of the stream just after it has entered the wheel, is sensibly greater than the section of the stream as it leaves the guides, and that, consequently, if the stream flowed according to the hypothesis, there must have been a sudden change in the velocity of the water, causing a shock, which, according to the common theory, implies a loss of power. This indicates a defect in the design; nevertheless, the success attending this first essay, on a large scale, of a centre-vent water-wheel, in which due regard has been paid to accuracy of construction and perfection of workmanship, guided by such light as the present imperfect theories can afford, ought to encourage us to hope, that, when it has received the same degree of attention as the turbine, it will not be much behind that celebrated motor, iu its economical use of water. EXPERIMENTS..
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