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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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Presently he walked to an old soap box holding metal odds and ends, washers, bolts and so on. This he up-ended. He sat down, his lean jaws working as he chewed his own gum slowly. Around him, like three detectives watching the effect of a surprise accusation, stood the chums."Get up!" the latter cried. "Why do you grovel there? Faugh! you sicken me. Is there no spark of manhood in you at all? You are going to die."
ONE:"Your brother's name was Leon Lalage?" Prout asked. THREE:CHAPTER XXXV. MILLING.

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ONE:29
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ONE:"So near and yet so far," said Balmayne between his teeth. "The best thing would be to climb the railings and hide in one of the gardens, only it would mean abandoning the car. And we might just as well give ourselves up as that."
THREE:

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THREE:A little farther on I discovered a good many other mounds. A cross made of two little pieces of wood stood on each, amongst pots with flowers and small posies. On one of the crosses I saw written in pencil

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FORE:"You couldn't prove it," he said, moodily, "but I can, I must. Prout, I am the sport of either a most amazing piece of misfortune or else the victim of the most cunning and diabolical scheme that man ever dreamed of. I was actually in the corner house within an hour or so of the murder."If she could only communicate with Gordon! But how was that to be done? Hetty thought for a moment. Then the inspiration came to her. In her stockinged feet she crept down to the basement to the housekeeper's room and closed the door behind her. She was not more than a minute gone, and when she reached her room again it was with the knowledge that she could count on somebody now.

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FORE:

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FORE:If you boys were with Jeff you must be all right, the man advanced, hand extended.

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FORE:Good gracious golly! gasped Dick.

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FORE:A few years ago, or even at the present time, many school-books in use which treat of mechanics in connection with natural philosophy are so arranged as to hinder a learner from grasping a true conception of force, power, and motion; these elements were confounded with various agents of transmission, such as wheels, wedges, levers, screws, and so on. A learner was taught to call these things "mechanical powers," whatever that may mean, and to compute their power as mechanical elements. In this manner was fixed in the mind, as many can bear witness, an erroneous conception of the relations between power and the means for its transmission; the two things were confounded together, so that years, and often a lifetime, has not served to get rid of the idea of power and mechanism being the same. To such teaching can be traced nearly all the crude ideas of mechanics so often met with among those well informed in other matters. In the great change from empirical rules to proved constants, from special and experimental knowledge to the application of science [4] in the mechanic arts, we may, however, go too far. The incentives to substitute general for special knowledge are so many, that it may lead us to forget or underrate that part which cannot come within general rules.The alliance between Neo-Pythagoreanism and Stoicism did not last long. Their fundamental principles were too radically opposed to admit of any reconciliation, except what could be effected by the absorption of both into a more comprehensive system. And Roman Stoicism, at least, was too practical, too scientific, too sane, to assimilate what must have seemed a curious amalgam of mathematical jugglery and dreamy asceticism; while the reputation of belonging to248 what passed for a secret society would be regarded with particular dread in the vicinity of the imperial court,it was, in fact, for this particular reason that the elder Seneca persuaded his son to renounce the vegetarian diet which Sotion had induced him to adopt,and the suspicious hostility of the public authorities may have had something to do with the speedy disappearance of Neo-Pythagoreanism from Rome.388 On the other hand, so coarsely materialistic and utilitarian a doctrine as that of the Porch, must have been equally repulsive to the spiritualism which, while it discerned a deep kinship permeating all forms of animal existence, saw in the outward conditions of that existence only the prison or the tomb where a heaven-born exile lay immured in expiation of the guilt that had driven him from his former and well-nigh forgotten abode. Hence, after Seneca, we find the two schools pursuing divergent directions, the naturalism of the one becoming more and more contrasted with the spiritualism of the other. It has been mentioned how emphatically Marcus Aurelius rejected the doctrine of a future life, which, perhaps, had been brought under his notice as a tenet of the Neo-Pythagoreans. The latter, on their side, abandoned the Stoic cosmology for the more congenial metaphysics of Plato, which they enriched with some elements from Aristotles system, but without in the least acknowledging their obligations to those two illustrious masters. On the contrary, they professed to derive their hidden wisdom from certain alleged writings of Pythagoras and his earlier disciples, which, with the disregard for veracity not uncommon among mystics, they did not scruple to forge wholesale. As a consequence of their unfortunate activity, literature was encumbered with a mass of worthless productions, of which many fragments still survive, mixed, perhaps, with some genuine relics of old Italiote speculation, the extrication of which is, however, a task of almost insuperable difficulty.

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FORE:Were it not that moral influences in learning mechanics, as in all other kinds of education, lie at the bottom of the whole matter, the subject of this chapter would not have been introduced. But it is the purpose, so far as possible, to notice everything that concerns an apprentice and learner, and especially what he has to deal with at the outset; hence some remarks upon the nature of apprentice engagements will not be out of place. To acquire information or knowledge of any kind successfully and permanently, it must be a work of free volition, as well as from a sense of duty or expediency; and whatever tends to create love and respect for a pursuit or calling, becomes one of the strongest incentives for its acquirement, and the interest taken by an [19] apprentice in his business is for this reason greatly influenced by the opinions that he may hold concerning the nature of his engagement.Besides the general religious movement which had long been in action, and was daily gaining strength from the increasing barbarisation of the empire, there was, at this juncture, a particular cause tending to bring Greek philosophy into close alliance with the mythology which it had formerly rejected and denounced. This was the rapid rise and spread of Christianity. St Augustine has said that of all heathen philosophers none came nearer to the Christian faith than the Neo-Platonists.528 Nevertheless, it was in them that the old religion found its only apologists and the new religion its most active assailants. We have already alluded to the elaborate polemic of Porphyry. Half a century later, the same principles could boast of a still more illustrious champion. The emperor Julian was imbued with the doctrines of Neo-Platonism, and was won back to the ancient faith by the teaching of its professors.

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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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Presently he walked to an old soap box holding metal odds and ends, washers, bolts and so on. This he up-ended. He sat down, his lean jaws working as he chewed his own gum slowly. Around him, like three detectives watching the effect of a surprise accusation, stood the chums."Get up!" the latter cried. "Why do you grovel there? Faugh! you sicken me. Is there no spark of manhood in you at all? You are going to die."
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Here we need no deliverance from troubles and indignities which are not felt; nor do we need to be prepared for death, knowing that we can never die. The world will no longer look askance at us, for we have ceased to concern ourselves about its reformation. No scepticism can shake our convictions, for we have discovered the secret of all knowledge through the consciousness of that which is eternal in ourselves. Thus the world of outward experience has dropped out of our thoughts, because thought has orbed into a world of its own.The words last quoted, which in a Christian sense are true enough, lead us over to the contrasting view of Aristotles theology, to the false theory of it held by critics like Prof. St. George Mivart. The Stagirite agrees with Catholic theism in accepting a personal God, and he agrees with the First Article of the English Church, though not with the Pentateuch, in saying that God is without parts or passions; but there his agreement ceases. Excluding such a thing as divine interference with nature, his theology of course excludes the possibility of revelation, inspiration, miracles, and grace. Nor is this a mere omission; it is a necessity of the system. If there can353 be no existence without time, no time without motion, no motion without unrealised desire, no desire without an ideal, no ideal but eternally self-thinking thoughtthen it logically follows that God, in the sense of such a thought, must not interest himself in the affairs of men. Again, Aristotelianism equally excludes the arguments by which modern theologians have sought to prove the existence of God. Here also the system is true to its contemporaneous, statical, superficial character. The First Mover is not separated from us by a chain of causes extending through past ages, but by an intervening breadth of space and the wheels within wheels of a cosmic machine. Aristotle had no difficulty in conceiving what some have since declared to be inconceivable, a series of antecedents without any beginning in time; it was rather the beginning of such a series that he could not make intelligible to himself. Nor, as we have seen, did he think that the adaptation in living organisms of each part to every other required an external explanation. Far less did it occur to him that the production of impressions on our senses was due to the agency of a supernatural power. It is absolutely certain that he would have rejected the Cartesian argument, according to which a perfect being must exist if it be only conceivableexistence being necessarily involved in the idea of perfection.252 Finally, not recognising such a faculty as conscience, he would not have admitted it to be the voice of God speaking in the soul.By placing the axes of tangent gearing so that the threads or teeth of the pinions are parallel to the face of the driven teeth, [53] as in the planing machines of Messrs Wm. Sellers & Co., the conditions of operation are changed, and an interesting problem arises. The progressive or forward movement of the pinion teeth may be equal to the sliding movement between the surfaces; and an equally novel result is, that the sliding action is distributed over the whole breadth of the driven teeth.In handling a weight with the hands it is carefully raised, and laid down with care, but moved as rapidly as possible throughout the intervening distance; this lesson of nature has not been disregarded. We find that the attention of engineers has been directed to this principle of variable speed to be controlled at will. The hydraulic cranes of Sir William Armstrong, for example, employ this principle in the most effective manner, not only securing rapid transit of loads when lifted, but depositing or adjusting them with a care and precision unknown to mechanism positively geared or even operated by friction brakes."8. Liberate prisoners of war.Both increate and indestructible,
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