Treatise Relative to the Testing of Waterwheels and Machinery: With Various Other Matters Pertaining to Hydraulics |
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12 Feet 20 Feet belt bobbin in inches Boyden buckets cent central discharge chutes opened cubic feet cubic foot Cubic Per feet curb Depth on Weir downward discharge Dynamometer effect engine fall feet head feet of water feet per minute FEET PER SECOND Foot lbs Fourneyron frame front roll gate opening gears H. P. Section Head in Feet Head Reduced Holyoke Machine horse power horse-power hydraulic inches in diameter JAMES EMERSON Leffel Lowell MANUFACTURED Mason Machine Mass Mean power required Mill Power Monohansett patent penstock pounds pulley register gate required to drive Revolutions of drum Revolutions of front revolutions of spindles revolutions per minute Risdon Scroll Section of Stream shaft speed Spindles per horse spinning frames Stream in Square Swain testing flume travers on bobbin trial turbine builders VASSALBORO Velocity due Head Water Power Water Wheels water-power Weight wheel tested Whole Gate windlass yarn
Popular passages
Page 211 - Watt began to introduce his steam-engines, he wished to be able to state their power as compared with that of horses, which were then generally employed for driving mills. He accordingly made a series of experiments, which led him to the conclusion that the average power of a horse was sufficient to raise about 33,000 Ibs.
Page 49 - ... in the wheel 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...
Page 108 - The height of the surface of the water in the canal, above the crest of the weir, is to be taken for the depth upon the weir; this height should be taken at a point far enough from the weir to be unaffected by the curvature caused by the discharge; if more convenient, it may be taken by means of a pipe opening near the bottom of the canal near the upstream side of the weir, which pipe may be made to communicate with a box placed in any convenient situation; and if the box and pipe do not leak, the...
Page 18 - 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...
Page 49 - ... 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 on the wheel. The Plates show a section of this Turbine, and a quadrant of its water-wheel of the natural or full size.
Page 211 - Multiply the revolutions of the first wheel by its number of teeth or its diameter, and divide the product by the number of teeth or the diameter of the last wheel.
Page 48 - Another, with 126 feet, gave 81 per cent. ; and one with 144 feet fall gave 80 per cent. At the instance of M. Arago, a commission of inquiry was instituted by the Government of France, and examined the turbine of Inval, near Paris, the total fall of water being 6 feet 6 inches, as has been before mentioned.
Page 18 - ... looseness in contracts pertaining to milling matters that has been productive of an immense amount of vexatious and expensive litigations. It is only necessary to glance at the methods adopted by the various Water Power Companies of the country for determining the quantity of water leased — to learn that there has been no generally recognized standard for such measurements even among those claiming to be engineers and experts in such matters; it would seem that the average boy, ten years of...
Page 48 - 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.
Page 211 - Multiply the diameter of driver by the number of teeth in the pinion, and divide the product by the number of teeth in the driver, and the quotient will be the diameter of pinion.