The Steam-engine and Other Heat-enginesAt the University Press, 1894 - 400 pàgines |
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Altres edicions - Mostra-ho tot
Frases i termes més freqüents
action adiabatic expansion adiabatic process admission allowed amount of heat atmosphere boiler pressure Carnot's cycle chamber clearance cold combustion compound engine compression condensing engine connecting-rod constant pressure cooling corresponding crank crank-pin curve displacement drawn eccentric efficiency entropy entropy-temperature diagram equal equation exhaust feed-water fluid friction fuel furnace gas-engine gases gear governor heat rejected heat taken heat-engine Hence high-pressure cylinder horizontal horse-power horse-power-hour increased indicator diagram Inst internal energy isothermal jacket Joule large cylinder latent heat locomotive marine means mechanical mechanical efficiency mixture motion passes piston piston-rod Proc pump quantity ratio of expansion re-evaporation rejecting heat reversible reversible engine revolutions per minute saturated steam shaft slide-valve specific heat speed square inch steam-engine stroke substance superheated supply surface surface condensation T₁ T₂ temperature thermal units thermodynamic thermodynamic efficiency trials tubes valve vessel volume whole Willans
Passatges populars
Pàgina 13 - I intend, in many cases, to employ the expansive force of steam to press on the pistons, or whatever may be used instead of them, in the same manner as the pressure of the atmosphere is now employed in common fire engines. In cases where cold water cannot be had in plenty, the engines may be wrought by this force of steam only, by discharging the steam into the open air, after it has done its office.
Pàgina 5 - An admirable and most forcible way to drive up water by fire, not by drawing or sucking it upwards, for that must be as the philosopher calleth it, infra spheeram activitatis, which is but at such a distance. But this way hath no bounder, if the vessels be strong enough ; for I have taken a piece of a whole cannon, whereof the end was burst, and filled it...
Pàgina 15 - I soon relinquished the idea of constructing an engine upon this principle, from being sensible it would be liable to some of the objections against Savery's engine, viz., the danger of bursting the boiler, and the difficulty of making the joints tight, and also that a great part of the power of the steam would be lost, because no vacuum was formed to assist the descent of the piston.
Pàgina 5 - ... stopping and screwing up the broken end, as also the touch-hole, and, making a constant fire under it, within twenty-four hours it burst, and made a great crack...
Pàgina 85 - If the absolute temperature of any uniformly hot substance be divided into any number of equal parts, the effects of those parts in causing work to be performed are equal...
Pàgina 12 - ... first, that vessel in which the powers of steam are to be employed to work the engine, which is called the cylinder...
Pàgina 5 - So that, having a way to make my vessels so that they are strengthened by the force within them, and the one to fill after the other, I have seen the water run like a constant fountain stream forty feet high.
Pàgina 17 - The means of accomplishing these points did not immediately present themselves ; but early in 1765 it occurred to me, that if a communication were opened between a cylinder containing steam, and another vessel which was exhausted of air and other fluids, the steam, as an elastic fluid, would immediately rush into the empty vessel, and continue to do so until it had established an equilibrium ; and if that vessel were kept very cool by an injection or otherwise, more steam would continue to enter...
Pàgina 15 - ... diameter, with a solid piston, and furnished also with a cock to admit the steam from the digester, or shut it off at pleasure, as well as to open a communication from the inside of the syringe to the open air, by which the steam contained in the syringe might escape. When the communication between the...
Pàgina 16 - A. mall engine was therefore constructed with a cylinder six inches diameter, and twelve inches stroke, made of wood, soaked in linseed oil, and baked to dryness. With this engine many experiments were made ; but it was soon found that the wooden cylinder was not likely to prove durable, and that the steam condensed in filling it still exceeded the proportion of that required for large engines according to the statements of Desaguliers. It was also found, that all attempts to produce a better exhaustion...