The steam engine familiarly explained and illustrated; with an historical sketch of its invention and progressive improvement; its applications to navigation and railwaysBooks on Demand, 1840 - 350 páginas |
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Página 20
... mercury , which is a fluid mineral , but being heated by fire , exhales in vapour , and mixes with the air for a time ; but after the said vapour is cooled , it returns to its first nature of quicksilver . The vapour of water is much ...
... mercury , which is a fluid mineral , but being heated by fire , exhales in vapour , and mixes with the air for a time ; but after the said vapour is cooled , it returns to its first nature of quicksilver . The vapour of water is much ...
Página 40
... mercury , be also provided . Applying the finger at A , so as to prevent the mercury in the tube from falling out , let the tube be in- verted , and the end , stopped by the finger , plunged into the mercury in c . When the end of the ...
... mercury , be also provided . Applying the finger at A , so as to prevent the mercury in the tube from falling out , let the tube be in- verted , and the end , stopped by the finger , plunged into the mercury in c . When the end of the ...
Página 41
... mercury , let them all be gently inverted , so as to have their closed ends up , as here represented . It will be found that the mercury will be sus- tained in all , and that the difference of the levels in all will be the same . † Thus ...
... mercury , let them all be gently inverted , so as to have their closed ends up , as here represented . It will be found that the mercury will be sus- tained in all , and that the difference of the levels in all will be the same . † Thus ...
Página 42
... mercury de- scended , is a vacuum . If , however , it were occupied by a quantity of air in a rarefied state , or any other gas or vapour , such gas or yapour would press on the surface of the mercury at D , with a force determined by ...
... mercury de- scended , is a vacuum . If , however , it were occupied by a quantity of air in a rarefied state , or any other gas or vapour , such gas or yapour would press on the surface of the mercury at D , with a force determined by ...
Página 43
... mercury whose weight will represent the pressure of the vapour or gas in the top of the tube . ( 26. ) Whenever the air contained in any vessel or other enclosed space has by any means had its pressure reduced so as to be rendered less ...
... mercury whose weight will represent the pressure of the vapour or gas in the top of the tube . ( 26. ) Whenever the air contained in any vessel or other enclosed space has by any means had its pressure reduced so as to be rendered less ...
Índice
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Términos y frases comunes
admitted air-pump already described amount applied ascend atmospheric engine atmospheric pressure attached axle beam boiler boiling bottom Boulton and Watt carriage centre chimney cistern closed coals cock cold water combustion communication condenser connecting rod constructed contrivance crank cubic cylinder descending diameter diminished driving elastic equal evaporation expansion experiments feet filled fire fire-box flues fly-wheel force fuel furnace greater heat imparted improved increased invention James Watt latent heat lever load locomotive engines machine magnitude means mechanical effect mercury miles motion moving power necessary opened parallel motion passage passing pipe piston piston-rod placed plate position pounds pressed principle produced propelling proportion pump quantity of water railway raised rendered represented in fig resistance Samuel Morland screws slide space speed square inch steam engine stopcock stroke sufficient sun wheel supply suppose surface temperature thermometer throttle-valve tube upwards vacuum valve H vapour velocity vertical vessel Watt weight wheels
Pasajes populares
Página 314 - ... giving the feeble arm of man the momentum of an Afrite; commanding manufactures to arise, as the rod of the prophet produced water in the desert; affording the means of dispensing with that time and tide which wait for no man; and of sailing without that wind which defied the commands and threats of Xerxes himself.
Página 24 - ... 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...
Página 316 - And certainly no man ever bestowed such a gift on his kind. The blessing is not only universal, but unbounded ; and the fabled inventors of the plough and the loom, who were Deified by the erring gratitude of their rude contemporaries, conferred less important benefits on mankind than the inventor of our present steam-engine.
Página 316 - It would .be difficult to estimate the value of the benefits which these inventions have conferred upon the country. There is no branch of industry that has not been indebted to them ; and in all the most material, they have not only widened most magnificently the field of its exertions, but multiplied a thousandfold the amount of its productions. It...
Página 307 - ... that the latter are contained in it in a latent state, so as not to be sensible to the thermometer or to the eye ; and if light be only a modification of heat, or a circumstance attending it, or a component part of the inflammable air, then pure or dephlogisticated air is composed of water deprived of its phlogiston, and united to elementary heat ?
Página 315 - This potent commander of the elements — this abridger of time and space — this magician, whose cloudy machinery has produced a change on the world, the effects of which, extraordinary as they are, are, perhaps, only now beginning to be felt — was not only the most profound man of science — the most successful combiner of powers, and calculator of numbers, as adapted to practical purposes — was not only one of the most generally well-informed, but one of the best and kindest of human beings.
Página 315 - By his admirable contrivance, it has become a thing stupendous alike for its force and its flexibility — for the prodigious power which it can exert, and the ease, and precision, and ductility, with which that power can be varied, distributed, and applied. The trunk of an elephant, that can pick up a pin or rend an oak, is as nothing to it.
Página 315 - W"e have said that Mr. Watt was the great improver of the steam-engine ; but, in truth, as to all that is admirable in its structure, or vast in its utility, he should rather be described as its inventor. It was by his inventions that its action was so regulated, as to make it capable of being applied to the finest and most delicate manufactures, and its power so increased, as to set weight and solidity at defiance. By his admirable...
Página 317 - His astonishing memory was aided, no doubt, in a great measure, by a still higher and rarer faculty — by his power of digesting and arranging in its proper place all the information he received, and of casting aside and rejecting, as it were instinctively, whatever was worthless or immaterial.
Página 318 - There was nothing of effort indeed, or impatience, any more than of pride or levity, in his demeanour : and there was a finer expression of reposing strength, and mild self-possession in his manner, than we ever recollect to have met with in any other person. He had in his character the utmost abhorrence for all sorts of forwardness, parade, and pretensions ; and, indeed, never failed to put all such impostors out of countenance, by the manly plainness and honest intrepidity of his language and deportment.
Referencias a este libro
Heroes of Invention: Technology, Liberalism and British Identity, 1750-1914 Christine MacLeod No hay ninguna vista previa disponible - 2007 |