Notes on the Theory of the Steam Engine: Being Part of a Course of Instruction in the Subject Given in the Royal School of Naval Architecture and Marine Engineering

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E. & F.N. Spon, 1871 - 48 Seiten
 

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Seite 30 - Each foot of fall in a water wheel is equally effective in doing work by means of the water wheel, and just so each degree of temperature passed through during the passage of heat from a hot body to a cold one is equally effective in causing work to be done by a heat engine working by means of this heat. The temperatures in question are, as our investigation shows, to be measured on the perfect gas thermometer, which is therefore entitled to be considered as a definite measure of temperature. Temperature,...
Seite 18 - В is the ratio of orifice to pipe diameter x is the ratio of the pressure drop at the orifice to the absolute static pressure at the upstream pressure tap k is the ratio of specific heats; that is, the ratio of the specific heat at constant pressure to the specific heat at constant volume For references, the above noted report may be mentioned, as well as "Quantity-Rate Fluid Meters,
Seite 35 - The classification of ovarian tumors has always been a bete noire among gynecologists and pathologists, and in the present state of our knowledge it does not seem possible to offer a classification which will meet with universal approval.
Seite 27 - ... heat, or of causing other bodies to yield it, and in order that a heat engine may function, it must have two sources, one hot and the other cold. From this statement it is seen even more directly perhaps than from that of Duhem that this principle rests upon what Poincare calls "the axiom of Clausius": "Heat cannot be made to pass from a cold body to a hot one.
Seite 6 - ... where p is the pressure in pounds per square inch, and t the temperature in degrees of Fahrenheit-s scale, estimated above 212 or simple atmospheric pressure.
Seite 43 - ... and represented in the diagram, per unit quantity of the working substance. Remember that in the entropy diagram the heat taken in during any operation is represented by the area under the line which represents that operation. The heat taken in by the feedwater of the steam-engine while it is rising from the temperature of the feed to the temperature of the boiler is represented by the area EADF. The next part of the operation is the conversion of the water into steam in the boiler. This is represented...
Seite 41 - L2+(pm- p3)vz an equation which enables us to find the dryness of the steam at the end of the expansion, if the final pressure of the steam be known, the mean pressure, and the original state of the steam.
Seite 43 - In the steam engine, when working under the most favourable conceivable circumstances, this condition is nearly but not exactly satisfied. For let us suppose that the ratio of expansion is such that the steam, after being cut off, expands until the pressure has fallen from the pressure in the boiler to the pressure in the condenser, and that that pressure corresponds to the temperature of the condenser, which in practice is not exactly the case, on account of the air contained in the steam ; let...
Seite 28 - Mechanical energy, then, is produced from heat by the transfer of heat from a hot body to a cold one...
Seite 8 - B are constants determined by trial, and h is the heat (in foot lbs.) required to raise the temperature of I lb. of water from 32° to t°, a quantity given in Eankine's tables in the column headed h.

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