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It is known how, in 1824, in his Réflexions sur la puissance motrice du feu, he endeavoured to prove that "the motive power of heat is independent of the agents brought into play for its realization," and that "its quantity is fixed solely by the temperature of the bodies between which, in the last resort, the transport of caloric is effected" at least in all engines in which "the method of developing the motive power attains the perfection of which it is capable"; and this is, almost textually, one of the enunciations of the principle at the present day.
Now these vast powers were always there no law of nature was broken, nor any new one introduced, when they were utilised to lighten man's labours and multiply his energies; all that has happened is that man has discovered existing laws and harnessed them to his use, and once more the real force motrice resides not in those silently-revolving engines that generate the electric current, but in the mind that devised and controls them.
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