An Elementary Treatise on SteamMacmillan, 1874 - Всего страниц: 412 |
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air-pump amount angle atmosphere back-pressure beam body boiler bolted brass calculated carbonic carbonic acid cast iron centre centrifugal force chimney co-efficient coal cock combustion condenser connecting-rod crank crank-pin crank-shaft cubic feet cubic foot curve cylinder cylinder engines diameter distance draught driving-wheels eccentric efficiency employed energy equal expansion feed-water fire-box float flues foot-pounds friction furnace gases given gives hence increase indicated H.P. indicator diagram initial pressure inside length lever liquid locomotive marine engines mean effective pressure means mercury minute moving opened ordinary oxygen p₁ parallel motion pass piston piston-rod placed plates pounds pump radius rails resistance revolutions per minute screw shaft shown side slide slide-valve smoke-box specific heat speed spring square inch steam stroke superheated surface temperature tubes usually valve vapour velocity vertical vessel volume weight wheels wrought iron
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Стр. 56 - It is impossible, by means of inanimate material agency, to derive mechanical effect from any portion of matter by cooling it below the temperature of the coldest of the surrounding objects.
Стр. 49 - The work done by a force is measured by the product of the force into the distance through which that force moves in its own direction.
Стр. 289 - The centrifugal force of the crank, crank-pin, and as much of the connecting rod as may be supposed, roughly, to follow the path of the crankpin (say one-half of it). The mass or weight of each of these multiplied by the distance of its centre of gravity from the...
Стр. 353 - The remedy for this cause of loss is to prevent that spontaneous liquefaction of the steam during its expansive working, in which the process just described originates ; and that is done either by enclosing the cylinder in a jacket or casing supplied with hot steam from the boiler, or by superheating the steam before its admission into the cylinder, or by both these means combined. The steam is thus kept in a nearly dry state, so as to be a bad conductor of heat ; and the moisture which it contains,...
Стр. 43 - Vapor density is the weight of a volume of pure vapor or gas (with no air present) compared to the weight of an equal volume of dry air at the same temperature and pressure.
Стр. 215 - L the length of the piston stroke in feet; A the area of the piston in square inches; and N the number of revolutions of the engine crank shaft per minute.
Стр. 46 - It may be stated as follows : The volume of a gas at constant temperature varies inversely as the pressure. This may also be expressed in symbols as P : P...
Стр. 34 - Watt, conducted on this principle, it appears that steam of 212°, in being condensed into water of 212°, gives out as much heat as would raise the temperature of an equal weight of water by 950 degrees, all of which had previously existed in the vapour without being sensible to a thermometer.
Стр. 313 - ... and as for misshapen and ill-proportioned vessels, there does not exist any theory capable of giving their resistance by previous computation.
Стр. 6 - Vs to 32 R, where V represents the velocity in feet per second, and R. is the radius of the circle expressed in feet. Now, on the 25th of December the barometer fell £ an inch below its mean height, throughout a circle whose radius was 400 miles.