Treatise Relative to the Testing of Water-wheels and Machinery: With Various Other Matters Pertaining to Hydrodynamics

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Weaver, Shipman, Printers, 1881 - 359 Seiten

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Seite 64 - Lord, one thousand eight hundred and twelve, to be examined ; that I have examined the same, and find them conformable to law : and I do hereby return the same to the Secretary of State, within fifteen days from the date aforesaid, to wit: On this sixteenth day of October, in the year aforesaid. WILLIAM PINKKZY, Attorney General of the United States.
Seite 69 - ... are so small as to be easily obstructed or choked. The water enters the buckets in the direction of the tangent to the last element of the guide-curves, which is a tangent to the first element of the curved buckets. The water ought to press steadily against the curved buckets, entering them without shock or impulse, and quitting them without velocity, in order to obtain the greatest useful effect ; otherwise a portion of the water's power must be wasted or expended, without producing useful effect...
Seite 64 - The schedule, referred to in these letters patent, and making part of the same...
Seite 68 - ... France. The result far exceeded his expectations, but he had much prejudice to contend with, and it was not until 1834 that he constructed another, in Tranche Comte, at the iron-works of M.
Seite 68 - Ibs. ; it is said to be equal to fifty-six horses power, and to give a useful effect equal to 70 or 75 per cent. of the water power employed. It drives a spinning-mill belonging to M. d'Eichtal. A second turbine, at the same establishment, is worked by a column of water of 108 metres, or 354 feet high, which is brought into the machine by cast-iron pipes of 18 inches diameter of the local measure, or about 16| inches English. The diameter of the water-wheel is...
Seite 137 - Each wheel will be thoroughly tested from half to whole gate, and, if deemed best, under at least two different heads ; also under several feet of back water. At the conclusion of the trial, a full report will be made of the results obtained and of the workmanship, and probable durability of each kind of wheel tried. Turbine builders of this or any other country are invited to furnish wheels, and those proposing to do so should give notice of such intention as soon as possible. Tests to commence...
Seite 38 - Of The Friction Of The Apertures Of Spouting Fluids. The doctrine of this species of friction appears to be as follows: "1. The ratio of the friction of round apertures, is as their diameters, nearly; while the quantity expended, is as the squares of their diameters. "2. The friction of an aperture of any regular or irregular figure, is as the length of the sum of the circumscribing lines, nearly; the quantities being as the areas of the aperture, therefore "3. The less the head or pressure, and...
Seite 33 - Each mill-power at the respective falls is declared to be the right, during sixteen hours in a day, to draw from the nearest canal or water course of the grantors, and through the land to be granted, 38 cubic feet of water per second at the upper fall, when the head and fall there is 20 feet, or a quantity inversely proportionate to the height at other falls.
Seite 284 - ... wheel, and having its extreme end .pivoted to a stud fixed on the inner side of the rim of the receiving pulley. It will be seen from this description that the strain of the power received through the belt on A will necessarily react on the levers, and, through them, on the fixed wheel, which may be considered nothing more nor less than a support to these levers in sustaining them in position to connect the loose receiving pulley with the shaft. At...
Seite 351 - For example : — A stream flows through a flume 10 feet wide, and the depth of the water is 4 feet ; the area of the cross section will be 40 feet. The velocity is 150 feet per minute — 40 x 150 = 6,000 = the cubic feet of water flowing per minute.

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