A Treatise on Hydraulics

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The Macmillan Company, 1911 - Hydraulics - 505 pages
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Page 109 - U-tube deflections may run up to 24 inches, and therefore need not be read with any great nicety. The photo-recorder consists of a portable box in which a drum carrying Velox paper revolves before a fine vertical slit, just in front of which is locked one leg of the U-tube in such a position that the rays of light from an oil lamp will be partly intercepted on their way through the colored liquid in the lower half of the manometer. As the liquid rises and falls with the velocity in the pipe, it will...
Page 513 - It contains also a more complete statement than is found elsewhere of the evolution of physi cal laboratories in Europe and America. The book, while of interest to the general reader, is primarily intended for students and teachers of physics. The conviction is growing that, by a judicious introduction of historical matter, a science can be made more attractive. Moreover, the general view of the development of the human intellect which the history of a science affords is in itself stimulating and...
Page 200 - ... a poor location for the opening. Avoid perforated pipes, no matter where the holes are bored, laid transversely or longitudinally in the stream at different depths; avoid so-called piezometers of any form which project in any direction into the stream. After the Lowell hydraulic experiments were made, Francis sometimes used pipes with holes bored in a vertical plane in order to secure an average pressure across the stream, in recognition of the fact that the surface is not transversely level....
Page 90 - ... were a critical velocity at which, for any disturbance whatever, the water became stable, this velocity was much less than that at which it would become unstable for infinitely small disturbances ; or, in other words, suggesting that there were two critical values for the velocity in the tube, the one at which steady motion changed into eddies, the other at which eddies changed into steady motion.
Page 125 - Because of the converging of the streamlines as they approach the orifice, the cross section of the stream continues to diminish for a short distance outside the tank.
Page 198 - ... (5) Free access for air under the nappe should be made certain. (6) The weir should be set at right angles to the direction of flow. (7) The channel of approach should be straight for at least 25 ft. above the weir, of practically uniform cross-section, and of slight slope (preferably none). (8) Screens of coarse wire or baffles of wood should be set in the channel, if necessary, to equalize the velocities in different parts of the channel, but not nearer the crest than 25 ft. (9) The channel...
Page 494 - These two pages give the common logarithms of numbers between 1 and 10, correct to four places. Moving the decimal point n places to the right (or left) in the number is equivalent to adding n (or -n) to the logarithm. Thus, log 0.01.7453 = 0.2419 - 2 [= 2.2419].
Page 513 - This brief popular history gives in broad outline the development of the science of physics from antiquity to the present time. It contains also a more complete statement than is found elsewhere of the evolution of physi cal laboratories in Europe and America.
Page 129 - Thus, if a' and a are, respectively, the cross-sectional area of the jet at the vena contracta and the area of the orifice and C c is the coefficient of contraction, C c = — or a
Page 513 - The admirable choice and distribution of experiments, the masterly character of the discussions, the ample scope of the work and its attractive typography and make-up, constitute it a welcome addition to the text-books of this division of physics.

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