ONE:In compression processes no material is cut away as in cutting or grinding, the mass being forced into shape by dies or forms that give the required configuration. The action of compressing machines may be either intermittent, as in the case of rolling mills; percussive, as in steam hammers, where a great force acts throughout a limited distance; or gradual and sustained, as in press forging. Machines of application, for abrading or grinding, are constantly coming more into use; their main purpose being to cut or shape material too hard to be acted upon by compression or by cutting processes. It follows that the necessity for machines of this kind is in proportion to the amount of hard material which enters into manufactures; in metal work the employment of hardened steel and iron is rapidly increasing, and as a result, grinding machines have now a place among the standard machine tools of a fitting shop.An apprentice should never ask questions about simple and obvious matters, or about such things as he can easily learn by his own efforts. The more difficult a question is, the more pleasure a skilled man will take in answering it. In short, a learner should carefully consider questions before asking them. A good plan is to write them down, and when information is wanted about casting, never go to a foundry to interrupt a manager or moulder at melting time, nor in the morning, when no one wants to be annoyed with questions.
TWO:"it's prusic----" --Page 314I was scarcely outside the townlet when I met another little group of refugees, probably all members of one family. The mother was being supported by her daughters, all wept, and nervous exhaustion made them totter as they walked. Every moment the mother looked back pitifully at the conflagration which devoured all around, including her slender property, for which she had worked so many years.
THREE:In the face of such facts, to say, as Mr. Froude does, that Epicureanism was the creed of the men of science in the time of Julius Caesar111an assertion directly contradicted by Lange112is perhaps only of a piece with Mr. Froudes usual inaccuracy when writing about ancient history; but such declarations as that of Mr. Frederic Pollock, that the Epicurean system56 was a genuine attempt at a scientific explanation of the world; and was in its day the solitary protest against the contempt of physics which prevailed in the other post-Aristotelian schools;113 of Prof. Trezza, that the Epicurean school summed up in itself the most scientific elements of Greek antiquity;114 of Dr. Woltjer, that with respect to the laws and principles of science, the Epicureans came nearest of all the ancients to the science of our own time;115 and finally, of M. Ernest Renan, that Epicureanism was the great scientific school of antiquity,116 are absolutely amazing. The eminent French critic just quoted has elsewhere observed, with perfect justice, that the scientific spirit is the negation of the supernatural; and perhaps he argues that the negation of the supernatural must, reciprocally, be the scientific spirit. But this is only true when such a negation is arrived at inductively, after a disinterested survey of the facts. Epicurus started with the denial of supernatural interference as a practical postulate, and then hunted about for whatever explanations of natural phenomena would suit his foregone conclusion. Moreover, an enquirer really animated by the scientific spirit studies the facts for their own sake; he studies them as they actually are, not resting content with alternative explanations; and he studies them to the fullest extent of which his powers are capable. Epicurus, on the contrary, declares that physics would not be worth attending to if the mind could be set free from religious terrors in any other manner;117 he will not let himself be tied down to any one theory if there are others equally inconsistent with divine agency to be had;118 and when his demands in this respect are satisfied, that is, when the appearances vulgarly ascribed to supernatural causation have been provided with natural causes, he leaves off.So strong, however, was the theological reaction against Greek rationalism that Epicurus himself came under its influence. Instead of denying the existence of the gods altogether, or leaving it uncertain like Protagoras, he asserted it in the most emphatic manner. Their interference with Nature was all that he cared to dispute. The egoistic character of his whole system comes out once more in his conception of them as beings too much absorbed in their own placid enjoyments to be troubled with the work of creation and providence. He was, indeed, only repeating aloud what had long been whispered in the free-thinking circles of Athenian society. That the gods were indifferent to human interests81 was a heresy indignantly denounced by Aeschylus,159 maintained by Aristodmus, the friend of Socrates, and singled out as a fit subject for punishment by Plato. Nor was the theology of Aristotles Metaphysics practically distinguishable from such a doctrine. Although essential to the continued existence of the cosmos, considered as a system of movements, the Prime Mover communicates the required impulse by the mere fact of his existence, and apparently without any consciousness of the effect he is producing. Active beneficence had, in truth, even less to do with the ideal of Aristotle than with the ideal of Epicurus, and each philosopher constructed a god after his own image; the one absorbed in perpetual thought, the other, or more properly the others, in perpetual enjoyment; for the Epicurean deities were necessarily conceived as a plurality, that they might not be without the pleasure of friendly conversation. Nevertheless, the part assigned by Aristotle to his god permitted him to offer a much stronger proof of the divine existence and attributes than was possible to Epicurus, who had nothing better to adduce than the universal belief of mankind,an argument obviously proving too much, since it told, if anything, more powerfully for the interference than for the bare reality of supernatural agents.
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