The Conservation of Energy: Being an Elementary Treatise on Energy and Its Laws

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H. S. King & Company, 1873 - 180 páginas
 

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Página 134 - Aristotle decides that there is no void, on such arguments as this :' — In a void there could be no difference of up and down ; for as in nothing there are no differences, so there are none in a privation or negation...
Página 7 - ... has given up its pretension to stand as an absolute beginning, and serves only as a necessary rest for exhausted analysis, before setting forth on the return journey of deduction.
Página 153 - Universe as a candle not lit, then it is perhaps conceivable to regard it as having been always in existence ; but if we regard it rather as a candle that has been lit, we become absolutely certain that it cannot have been burning from eternity, and that a time will come when it will cease to burn. We are led to look to a beginning in which the particles of matter were in a diffuse chaotic state, but endowed with the power of gravitation ; and we are led to look to an end in which the whole Universe...
Página 136 - The ancients possessed great genius and intellectual power, but they were deficient in physical conceptions, and, in consequence, their ideas were not prolific. It cannot indeed be said that we of the present age are deficient in such conceptions ; nevertheless, it may be questioned whether there is not a tendency to rush into the opposite extreme, and to work physical conceptions to an excess.
Página 142 - Clausius, Tait, Andrews, Maxwell, who, along with many others, have advanced the subject ; and while Joule gave his chief attention to the laws which regulate the transmutation of mechanical energy into heat, Thomson, Rankine, and Clausius gave theirs to the converse problem, or that which relates to the transmutation of heat into mechanical energy. Thomson, especially, has pushed forward so resolutely from this point of view that he has succeeded in grasping a principle scarcely inferior in importance...
Página 153 - ... happen to its visible energy. We have spoken already about a medium pervading space, the office of which appears to be to degrade and ultimately extinguish all differential motion, just as it tends to reduce and ultimately equalize all difference of temperature. Thus the universe would ultimately become an equally heated mass, utterly worthless as far as the production of work is concerned, since such production depends upon difference of temperature. Although, therefore, in a strictly mechanical...

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