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Irregularity of cooling may be the result of unequal conducting power in different parts of a mould or cores, or it may be [98] from the varying dimensions of the castings, which contain heat as their thickness, and give it off in the same ratio. As a rule, the drag or bottom side of a casting cools first, especially if a mould rests on the ground, and there is not much sand between the castings and the earth; this is a common cause of unequal cooling, especially in large flat pieces. Air being a bad conductor of heat, and the sand usually thin on the cope or top side, the result is that the top of moulds remain quite hot, while at the bottom the earth, being a good conductor, carries off the heat and cools that side first, so that the iron 'sets' first on the bottom, afterwards cooling and contracting on the top, so that castings are warped and left with inherent strains.
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THREE:

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THREE:Thin sections of steel tools being projections from the mass which supports the edges, are cooled first, and if provision is not made to allow for contraction they are torn asunder.

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THREE:Meanwhile a new and powerful agency was about to interpose with decisive effect in the doubtful struggle. This was the study of mathematics. Revived by the Arabians and never wholly neglected during the Middle Ages, it had profited by the general movement of the Renaissance, and was finally applied to the cosmical problem by Galileo. In this connexion, two points of profound philosophical interest must be noted. The first is that, even in its fall, the Aristotelian influence survived, to some extent, both for good and for evil. To Aristotle belongs the merit of having been the first to base astronomy on physics. He maintains the earths immobility on experimental no less than on speculative grounds. A stone thrown straight up in the air returns to its starting-point instead of falling to the west of it; and the absence of stellar385 parallax seems to show that there is no change in our position relatively to the heavenly bodies. After satisfying himself, on empirical considerations, that the popular astronomy is true, he proceeds to show that it must be true, by considerations on the nature of matter and motion, which, although mistaken, are conceived in a genuinely scientific spirit. Now Galileo saw that, to establish the Copernican system, he must first grapple with the Peripatetic physics, and replace it by a new dynamical theory. This, which he could hardly have effected by the ordinary mathematical methods, he did by borrowing the analytical method of Atomism and applying it to the measurement of motion. The law of falling bodies was ascertained by resolving their descent into a series of moments, and determining its rate of velocity at successive intervals; and curvilinear motions were similarly resolved into the combination of an impulsive with an accelerating force, a method diametrically opposed to that of Bacon, who would not even accept the rough analysis of the apparent celestial motions proposed by Greek astronomers.

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THREE:All these circumstances taken together would permit the Roman women to have opinions of their own if they liked, and would ensure a respectful hearing for whatever they had to say; while the men who had opinions to propagate would, for the same reason, be deeply interested in securing their adhesion. On the other hand, they received a good literary education, being sent apparently to the same schools as their brothers, and there made acquainted with, at least, the Latin poets.322 Thus they would possess the degree of culture necessary for readily receiving and transmitting new impressions. And we know, as a matter of fact, that many Roman ladies entered eagerly into the literary movement of the age, sharing the studies of their husbands, discoursing on questions of grammar, freely expressing their opinion on the relative merits of different poets, and even attempting authorship on their own account.323 Philosophy, as it was then taught, attracted a considerable share of their attention; and some great ladies were constantly attended by a Stoic professor, to whose lectures they listened seemingly with more patience210 than profit.324 One of their favourite studies was Platos Republic, according to Epicttus, because it advocated a community of wives;325 or, as we may more charitably suggest, because it admitted women to an equality with men. But there is no evidence to prove that their inquisitiveness ever went to the length of questioning the foundations of religious faith; and we may fairly reckon their increasing influence among the forces which were tending to bring about an overwhelming religious revival among the educated classes.

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THREE:"I'll tell you my opinion later on," he said. "I think that after an exhibition of my marvellous powers, you can safely leave the matter to me. Should you like to have a little bit of an adventure this evening?"127

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THREE:We have seen how Plato came to look on mathematics as217 an introduction to absolute knowledge. He now discovered a parallel method of approach towards perfect wisdom in an order of experience which to most persons might seem as far as possible removed from exact sciencein those passionate feelings which were excited in the Greek imagination by the spectacle of youthful beauty, without distinction of sex. There was, at least among the Athenians, a strong intellectual element in the attachments arising out of such feelings; and the strange anomaly might often be seen of a man devoting himself to the education of a youth whom he was, in other respects, doing his utmost to corrupt. Again, the beauty by which a Greek felt most fascinated came nearer to a visible embodiment of mind than any that has ever been known, and as such could be associated with the purest philosophical aspirations. And, finally, the passion of love in its normal manifestations is an essentially generic instinct, being that which carries an individual most entirely out of himself, making him instrumental to the preservation of the race in forms of ever-increasing comeliness and vigour; so that, given a wise training and a wide experience, the maintenance of a noble breed may safely be entrusted to its infallible selection.134 All these points of view have been developed by Plato with such copiousness of illustration and splendour of language that his name is still associated in popular fancy with an ideal of exalted and purified desire.
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THREE:"I did not gather that from Miss Lawrence's message," said Bruce uneasily.

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THREE:Leona closed the door behind her with a snap. She was alert and vigorous as a general in action now. She passed downstairs swiftly but firmly, and into the morning room. One by one she snapped up the electric lights till the whole room was bathed in a golden glow."On the whole you are doing her no more than justice," said Lawrence. "Still, we do know where she is now, and I am going to see her. If she falls into the hands of Prout now, we shall never get her to speak, and therefore we shall have no end of trouble to clear Bruce's name as it should be cleared. I'll just run round and get Charlton to accompany me. And then for a thrilling interview."

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THREE:Those who will may see in all this an anticipation of chemical substitution and double decomposition. We can assure them that it will be by no means the most absurd parallel discovered between ancient and modern ideas. It is possible, however, to trace a more real connexion between the Aristotelian physics and mediaeval thought. We do not of361 course mean the scholastic philosophy, for there never was the slightest doubt as to its derivation; we allude to the alchemy and astrology which did duty for positive science during so many centuries, and even overlapped it down to the time of Newton, himself an ardent alchemist. The superstitions of astrology originated independently of the peripatetic system, and probably long before it, but they were likely to be encouraged by it instead of being repressed, as they would have been by a less anthropomorphic philosophy. Aristotle himself, as we have seen, limited the action of the heavens on the sublunary sphere to their heating power; but, by crediting them with an immortal reason and the pursuit of ends unknown to us, he opened a wide field for conjecture as to what those ends were, and how they could be ascertained. That the stars and planets were always thinking and acting, but never about our affairs, was not a notion likely to be permanently accepted. Neither was it easy to believe that their various configurations, movements, and names (the last probably revealed by themselves) were entirely without significance. From such considerations to the casting of horoscopes is not a far remove. The Aristotelian chemistry would still more readily lend itself to the purposes of alchemy. If Nature is one vast process of transmutation, then particular bodies, such as the metals, not only may, but must be convertible into one another. And even those who rejected Aristotles logic with scorn still clung to his natural philosophy when it flattered their hopes of gain. Bacon kept the theory of substantial forms. His originality consisted in looking for a method by which any form, or assemblage of forms might be superinduced at pleasure on the underlying matter. The real development of knowledge pursued a far different course. The great discoverers of the sixteenth and seventeenth centuries achieved their success by absolutely reversing the method of Aristotle, by bringing into fruitful contact principles which he had condemned to barren isolation.362 They carried terrestrial physics into the heavens; they brought down the absoluteness and eternity of celestial law to earth; they showed that Aristotles antithetical qualities were merely quantitative distinctions. These they resolved into modes of motion; and they also resolved all motions into one, which was both rectilinear and perpetual. But they and their successors put an end to all dreams of transmutation, when they showed by another synthesis that all matter, at least within the limits of our experience, has the changeless consistency once attributed exclusively to the stellar spheres.Sandy did not smile. Instead, as they swung, he scanned the sky. That was not his instructions, but it was his determined plan.
"And he is perfectly right. That wonderful man always is right. Mamie is the only child of a sister of mine who lives in Florence. I wanted her once to impoverish herself to help me in one of my schemes, and she refused. By way of revenge I had her child stolen. That is some four years ago. She never knew I had a hand in it; she deems Mamie to be dead. When I am gone I want you to write to my sister and tell her what I am saying. Only you must get the address."Other reasons for the extended and general use of steam as a power, besides those already named, are to be found in the fact that no other available element or substance can be expanded to a given degree at so small a cost as water; and that its temperature will not rise to a point injurious to machinery, and, further, in the very important property of lubrication which steam possesses, protecting the frictional surfaces of pistons and valves, which it is impossible to keep oiled because of their inaccessibility or temperature.63"Ah, well, I am sincerely glad to hear that. You cannot believe what awful sorrow it gave us, Flemings, when we heard that the Netherlanders were conspiring with the Germans."Bruce nodded. He would keep his secret for the present even from Hetty. In any case this was not the place to discuss the great adventure.
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