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THREE:A cubic inch of water, by taking up a given amount of heat, is expanded to more than five hundred cubic inches of steam, at a pressure of forty-five pounds to the square inch. This extraordinary expansion, if performed in a close vessel, would exert a power five hundred times as great as would be required to force the same quantity of water into the vessel against this expansive pressure; in other words, the volume of the water when put into the vessel would be but one five-hundredth part of its volume when it is allowed to escape, and this expansion, when confined in a steam-boiler, exerts the force that is called steam-power. This force or power is, through the means of the engine and its details, communicated and applied to different kinds of work where force and movement are required. The water [33] employed to generate steam, like the engine and the boiler, is merely an agent through which the energy of heat is applied.

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THREE:"Go in and win," Balmayne whispered. "Always back your luck."On Alexander��s departure for the East, Aristotle returned to Athens, where he now placed himself at the head of a new philosophical school. The ensuing period of thirteen years288 was fully occupied by the delivery of public lectures, and by the composition of those encyclopaedic writings which will preserve his memory for ever, along, perhaps, with many others which have not survived. Like Anaxagoras, he was not allowed to end his days in the city of his adoption. His youthful attacks on Isocrates had probably made him many enemies among that rhetor��s pupils. It is supposed by Grote, but warmly disputed by Zeller, that his trenchant criticisms on Plato had excited a similar animosity among the sectaries of the Academy.178 Anyhow, circumstances had unavoidably associated him with the detested Macedonian party, although his position, as a metic, or resident alien, debarred him from taking any active part in politics. With Alexander��s death the storm broke loose. A charge was trumped up against Aristotle, on the strength of his unlucky poem in honour of Hermeias, which was described as an insult to religion. That such an accusation should be chosen is characteristic of Athenian bigotry, even should there be no truth in the story that certain philosophical opinions of his were likewise singled out for prosecution. Before the case came on for trial, Aristotle availed himself of the usual privilege allowed on such occasions, and withdrew to Chalcis, in order, as he said, that the Athenians need not sin a second time against philosophy. But his constitution, naturally a feeble one, was nearly worn out. A year afterwards he succumbed to a stomach complaint, aggravated, if not produced, by incessant mental application. His contemporary, Demosthenes, perished about the same time, and at the same age, sixty-two. Within little more than a twelvemonth the world had lost its three greatest men; and after three centuries of uninterrupted glory, Hellas was left unrepresented by a single individual of commanding genius.

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THREE:Chasing operations being lathe work, and involving no principles not already noticed, what is said further will be in reference to die-cutting or bolt-threading machines, which, simple as they may appear to the unskilled, involve, nevertheless [144] many intricacies which will not appear upon superficial examination.

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