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There is no use in entering upon detailed explanations of what a learner has before him. Shafts are seen wherever there is machinery; it is easy to see the extent to which they are employed to transmit power, and the usual manner of arranging them. Various text-books afford data for determining the amount of torsional strain that shafts of a given diameter will bear; explain that their capacity to resist torsional strain is as the cube of the diameter, and that the deflection from transverse strains is so many degrees; with many other matters that are highly useful and proper to know. I will therefore not devote any space to these things here, but notice some of the more obscure conditions that pertain to shafts, such as are demonstrated by practical experience rather than deduced from mathematical data. What is said will apply especially to what is called line-shafting for conveying and distributing power in machine-shops and other manufacturing establishments. The following propositions in reference to shafts will assist in understanding what is to follow:

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On the day of my stay at Charleroi, at about seven o'clock in the evening, there was a good deal of bustle round about the station, many trains from Maubeuge arriving. One of these trains was entirely filled by officers of the garrison who had been taken prisoner. Another carried only wounded Germans, lying on light stretchers, on which they were transported through the streets to the hospitals at Charleroi. Many had fearful wounds, and convulsively held their hands on the injured parts, while others lay still, the pallor of death on their face. Maubeuge must have cost the Germans enormous sacrifices, as for many of the wretched wounded no room could be found at Charleroi, and they had to be taken farther by train, to Namur or Brussels.
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Slider 1 ONE:As no motion except rotary can be continuous, and as rotary movement of tools is almost exclusively confined to shaping cylindrical pieces, a proper distinction between machine tools which operate in straight lines, and those which operate with circular movement, will be to call them by the names of rotary and reciprocating.The remarks, given in a former place, relating to tools for turning, apply to those for planing as well, except that in planing tools greater rigidity and strength are required.

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Slider 1 ONE:"'2. The soup had been offered to the British, but two refused to take it, says the German Government. Yes, it was offered these wretched people, but, as I have said already, the German soldiers kept the steaming soup before them, shouting at them: "You want to eat, you swine!you swine! you ought to be killed! This is what you may have!" And as they said the latter they aimed their rifles at the unfortunate men, whilst others who were not armed lifted up their fists and threatened them, or spat at them.Let us now see how he carries this passionate enthusiasm for knowledge into the humblest researches of zoology:

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Slider 3 ONE:In those days German Headquarters gave continuously the thoughtless order: "To Calais, to237 Calais," and the Staff considered no difficulties, calculated no sacrifices, in order to achieve success.Pencil-work is indeed the main operation, the inking being merely to give distinctness and permanency to the lines. The main thing in pencilling is accuracy of dimensions and stopping the lines where they should terminate without crossing others. The best pencils only are suitable for draughting; if the plumbago is not of the best quality, the points require to be continually sharpened, and the pencil is worn away at a rate that more than makes up the difference in cost between the finer and cheaper grades of pencils, to say nothing of the effect upon a drawing.

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ONE:"Are you? There is a well in that courtyard. And if perchance anything valuable got into that well, I should say that a rope would be the best way of getting it out. Now do you understand."

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THREE:An attempt has recently been made by M. Guyau to trace the influence of Epicurus on modern philosophy. We cannot but think the method of this able and lucid writer a thoroughly118 mistaken one. Assuming the recognition of self-interest as the sole or paramount instinct in human nature, to be the essence of what Epicurus taught, M. Guyau, without more ado, sets down every modern thinker who agrees with him on this one point as his disciple, and then adds to the number all who hold that pleasure is the end of action; thus making out a pretty long list of famous names among the more recent continuators of his tradition. A more extended study of ancient philosophy would have shown the French critic that moralists who, in other respects, were most opposed to Epicurus, agreed with him in holding that every man naturally and necessarily makes his own interest the supreme test of right conduct; and that only with the definition of welfare did their divergence begin. On the other hand, the selfish systems of modern times differ entirely from Epicureanism in their conception of happiness. With Hobbes, for instance, whom M. Guyau classes as an Epicurean, the ideal is not painlessness but power; the desires are, according to his view, naturally infinite, and are held in check, not by philosophical precepts but by mutual restraint; while, in deducing the special virtues, his standard is not the good of each individual, but the good of the wholein other words, he is, to that extent, a Stoic rather than an Epicurean. La Rochefoucauld, who is offered as another example of the same tendency, was not a moralist at all; and as a psychologist he differs essentially from Epicurus in regarding vanity as always and everywhere the great motive to virtue. Had the Athenian sage believed this he would have despaired of making men happy; for disregard of public opinion, within the limits of personal safety, was, with him, one of the first conditions of a tranquil existence. Nor would he have been less averse from the system of Helvtius, another of his supposed disciples. The principal originality of Helvtius was to insist that the passions, instead of being discouragedas all previous moralists, Epicurus among the number, had advisedshould be119 deliberately stimulated by the promise of unlimited indulgence to those who distinguished themselves by important public services. Of Spinoza we need say nothing, for M. Guyau admits that he was quite as much inspired by Stoic as by Epicurean ideas. At the same time, the combination of these two ethical systems would have been much better illustrated by modern English utilitarianism, which M. Guyau regards as a development of Epicureanism alone. The greatest happiness of the greatest number is not an individual or self-interested, but a universal end, having, as Mill has shown, for its ultimate sanction the love of humanity as a whole, which is an essentially Stoic sentiment. It may be added that utilitarianism has no sympathy with the particular theory of pleasure, whether sensual or negative, adopted by Epicurus. In giving a high, or even the highest place to intellectual enjoyments, it agrees with the estimate of Plato and Aristotle, to which he was so steadily opposed. And in duly appreciating the positive side of all enjoyments, it returns to the earlier hedonism from which he stood so far apart.

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THREE:

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THREE:None of them realized that Jeffs roaring engine drowned their cries.After definition and division comes reasoning. We arrange objects in classes, that by knowing one or some we may know all. Aristotle attributes to Socrates the first systematic employment of induction as well as of general definitions.96 Nevertheless, his method was not solely inductive, nor did it bear more than a distant resemblance to the induction of modern science. His principles were not gathered from the particular classes of phenomena which they determined, or were intended to determine, but from others of an analogous character which had already been reduced to order. Observing that all handicrafts were practised according to well-defined intelligible rules, leading, so far as they went, to satisfactory results, he required that life in its entirety should be similarly systematised. This was not so much reasoning as a demand for the more extended application of reasoning. It was a truly philosophic postulate, for philosophy is not science, but precedes and underlies it. Belief and action tend to divide themselves into two provinces, of which the one is more or less organised, the other more or less chaotic. We philosophise when we try to bring the one into order, and also when we test the foundations on which the order of the other reposes, fighting both against incoherent mysticism and against traditional routine. Such is the purpose that the most distinguished thinkers of modern timesFrancis Bacon, Spinoza, Hume, Kant, Auguste Comte, and Herbert Spencerhowever widely they may otherwise differ, have, according to their respective lights, all set themselves to achieve. No doubt, there is149 this vast difference between Socrates and his most recent successors, that physical science is the great type of certainty to the level of which they would raise all speculation, while with him it was the type of a delusion and an impossibility. The analogy of artistic production when applied to Nature led him off on a completely false track, the ascription to conscious design of that which is, in truth, a result of mechanical causation.97 But now that the relations between the known and the unknown have been completely transformed, there is no excuse for repeating the fallacies which imposed on his vigorous understanding; and the genuine spirit of Socrates is best represented by those who, starting like him from the data of experience, are led to adopt a diametrically opposite conclusion. We may add, that the Socratic method of analogical reasoning gave a retrospective justification to early Greek thought, of which Socrates was not himself aware. Its daring generalisations were really an inference from the known to the unknown. To interpret all physical processes in terms of matter and motion, is only assuming that the changes to which our senses cannot penetrate are homogeneous with the changes which we can feel and see. When Socrates argued that, because the human body is animated by a consciousness, the material universe must be similarly animated, Democritus might have answered that the world presents no appearance of being organised like an animal. When he argued that, because statues and pictures are known to be the work of intelligence, the living models from which they are copied must be similarly due to design, Aristodmus should have answered, that the former are seen to be manufactured, while the others are seen to grow. It might also have been observed, that if our own intelligence requires to be accounted for by a cause like itself, so also does the creative cause, and so on through an infinite regress of antecedents. Teleology has been destroyed by the Darwinian theory; but before the Origin of150 Species appeared, the slightest scrutiny might have shown that it was a precarious foundation for religious belief. If many thoughtful men are now turning away from theism, natural theology may be thanked for the desertion. I believe in God, says the German baron in Thorndale, until your philosophers demonstrate His existence. And then? asks a friend. And thenI do not believe the demonstration.

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THREE:Dr. Beckers, Government veterinary surgeon at Veldwezelt, had also been taken to Bilsen as a hostage. The Germans asserted that the Belgians in Lanaeken had taken prisoner a German military veterinary surgeon who looked after the horses, and now intended to keep Dr. Beckers until the Belgians191 should have released the German military veterinary surgeon.For implements procure two drawing-boards, forty-two inches long and thirty inches wide, to receive double elephant paper; have the boards plain without cleets, or ingenious devices for fastening the paper; they should be made from thoroughly seasoned lumber, at least one and one-fourth inches thick; if thinner they will not be heavy enough to resist the thrust of the T squares.

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ONE:"Here is the latchkey," he said. "There are several of them. There is no caretaker in the place as yet. Go in, you have no further need of me."

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THREE:Prout grew wooden. His official manner caused Leona to hide a smile. Really, it would be child's play to get the better of this man.

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ONE:I think that my answer left nothing to be desired for plainness, and Germany cannot have derived much pleasure from its official contradiction. Moreover, the editor of De Tijd had also made inquiries from the little girl whom I escorted from Louvain on the day of the occurrence at Landen, and although I admit at once that not too great a value can be attached to the evidence of a girl of nine, I insert here what the editor wrote about that interview:In multiplying the variations of a measuring implement by mechanism, it is obvious that movable joints must be employed; it is also obvious that no positive joint, whether cylindrical or flat, could be so accurately fitted as to transmit such slight movement as occurs in gauging or measuring. This difficulty is in most measuring instruments overcome by employing a principle not before alluded to, but common in many machines, that of elastic [151] compensation.

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THREE:Prout came up smiling in the course of the next afternoon. He was disposed to chaff his prisoner in a mild kind of way.

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THREE:Never mind old Suspicious Sandy, urged Dick. Let him read that, but you tell us.

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THREE:The amphibian is making for it! he yelled.17

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THREE:"I can't believe it," said Lady Rockingham. "Mr. Harcourt, are you quite clear and certain of your facts? Who told you?"

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ONE:Gilbert Lawrence had put away his books and papers with the air of a man who means to take a holiday. He did not seem in the least surprised.

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TWO:After determining the ultimate objects of an improvement, and laying down the general principles which should be followed in the preparation of a design, there is nothing connected with constructive engineering that can be more nearly brought within general rules than arranging details. I am well aware of how far this statement is at variance with popular opinion among mechanics, and of the very thorough knowledge of machine application and machine operation required in making designs, and mean that there are certain principles and rules which may determine the arrangement and distribution of material, the position and relation of moving parts, bearings, and so on, and that a machine may be built up with no more risk of mistakes than in erecting a permanent structure.

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TWO:Hetty smiled up into her lover's face. From under her long lashes she could see that Leona Lalage was regarding her intently.

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There is no use in entering upon detailed explanations of what a learner has before him. Shafts are seen wherever there is machinery; it is easy to see the extent to which they are employed to transmit power, and the usual manner of arranging them. Various text-books afford data for determining the amount of torsional strain that shafts of a given diameter will bear; explain that their capacity to resist torsional strain is as the cube of the diameter, and that the deflection from transverse strains is so many degrees; with many other matters that are highly useful and proper to know. I will therefore not devote any space to these things here, but notice some of the more obscure conditions that pertain to shafts, such as are demonstrated by practical experience rather than deduced from mathematical data. What is said will apply especially to what is called line-shafting for conveying and distributing power in machine-shops and other manufacturing establishments. The following propositions in reference to shafts will assist in understanding what is to follow:

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On the day of my stay at Charleroi, at about seven o'clock in the evening, there was a good deal of bustle round about the station, many trains from Maubeuge arriving. One of these trains was entirely filled by officers of the garrison who had been taken prisoner. Another carried only wounded Germans, lying on light stretchers, on which they were transported through the streets to the hospitals at Charleroi. Many had fearful wounds, and convulsively held their hands on the injured parts, while others lay still, the pallor of death on their face. Maubeuge must have cost the Germans enormous sacrifices, as for many of the wretched wounded no room could be found at Charleroi, and they had to be taken farther by train, to Namur or Brussels.

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"Come out of it, my lad," said the gruff one good-humouredly. "We've got you."Such, as it seems to us, is the proper spirit in which we should approach the great thinker whose works are to occupy us in this and the succeeding chapter. No philosopher has ever offered so extended and vulnerable a front to hostile criticism. None has so habitually provoked reprisals by his own incessant and searching attacks on all existing professions, customs, and beliefs. It might even be maintained that none has used the weapons of controversy with more unscrupulous zeal. And it might be added that he who dwells so much on the importance of consistency has occasionally denounced and ridiculed the very principles which he elsewhere upholds as demonstrated truths. It was an easy matter for others to complete the work of destruction which he had begun. His system seems at first sight to be made up of assertions, one more outrageous than another. The ascription of an objective concrete separate reality to verbal abstractions is assuredly the most astounding paradox ever173 maintained even by a metaphysician. Yet this is the central article of Platos creed. That body is essentially different from extension might, one would suppose, have been sufficiently clear to a mathematician who had the advantage of coming after Leucippus and Democritus. Their identity is implicitly affirmed in the Timaeus. That the soul cannot be both created and eternal; that the doctrine of metempsychosis is incompatible with the hereditary transmission of mental qualities; that a future immortality equivalent to, and proved by the same arguments as, our antenatal existence, would be neither a terror to the guilty nor a consolation to the righteous:are propositions implicitly denied by Platos psychology. Passing from theoretical to practical philosophy, it might be observed that respect for human life, respect for individual property, respect for marriage, and respect for truthfulness, are generally numbered among the strongest moral obligations, and those the observance of which most completely distinguishes civilised from savage man; while infanticide, communism, promiscuity, and the occasional employment of deliberate deceit, form part of Platos scheme for the redemption of mankind. We need not do more than allude to those Dialogues where the phases and symptoms of unnameable passion are delineated with matchless eloquence, and apparently with at least as much sympathy as censure. Finally, from the standpoint of modern science, it might be urged that Plato used all his powerful influence to throw back physical speculation into the theological stage; that he deliberately discredited the doctrine of mechanical causation which, for us, is the most important achievement of early Greek thought; that he expatiated on the criminal folly of those who held the heavenly bodies to be, what we now know them to be, masses of dead matter with no special divinity about them; and that he proposed to punish this and other heresies with a severity distinguishable from the fitful fanaticism of his native city only by its more disciplined and rigorous application.IV.The most perfect castings for gear wheels and pulleys and other pieces which can be so moulded, are made by drawing the patterns through templates without rapping. These templates are simply plates of metal perforated so that the pattern can be forced through them by screws or levers, leaving the sand intact. Such templates are expensive to begin with, because of the accurate fitting that is required, especially around the teeth of wheels, and the mechanism that is required in drawing the patterns, but when a large number of pieces are to be made from one pattern, such as gear wheels and pulleys, the saving of labour will soon pay for the templates and machinery required, to say nothing of the saving of metal, which often amounts to ten per cent., and the increased value of the castings because of their accuracy.
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