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2020-04-08 硬齒面齒輪精加工技術
2020-04-08 數控滾齒機的日常保潔
2020-04-08 小模數齒輪的高速幹切滾齒技術
2020-04-08 硬齒面刮削加工的關鍵技術分析

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2020-04-08 數控滾齒機的發展及應用
2020-04-08 數控滾齒機的工作原理及滾刀選擇
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As he handed me a writing he glowed kindly. It proved to be from Major Harper; a requisition upon this officer for shoes and clothing; not for a brigade, regiment or company, but for me alone, from hat to shoes. I tendered it back silently, and saw that he knew its purport already from the Major, and that the ladies knew it from him. The good fellow looked quite happy a moment, but then reddened as they joyfully crowded the car's doorway to see me fitted! "You don't mean it!" "So far you have made it quite plain," Leona murmured, "but I fail to see that all the rest was easy." The expense of forming pattern-moulds may be considered as divided between the foundry and pattern-shop. What a pattern-maker saves a moulder may lose, and what a pattern-maker spends a moulder may save; in other words, there is a point beyond which saving expense in patterns is balanced by extra labour and waste in moulding—a fact that is not generally realised because of inaccurate records of both pattern and foundry work. What is lost or saved by judicious or careless management in the matter of patterns and moulding can only be known to those who are well skilled in both moulding and pattern-making. A moulder may cut all the fillets in a mould with a trowel; he may stop off, fill [94] up, and print in, to save pattern-work, but it is only expedient to do so when it costs very much less than to prepare proper patterns, because patching and cutting in moulds seldom improves them. As we went on towards Eerneghem French aviators were heroically reconnoitring above the German lines. One came from Dixmuiden and one from Nieuwpoort; both went to about half-way between these two towns, where the centre of the battle was. The Germans kept up an unbroken artillery fire at those birds in the air. I saw quite near to them shells exploding right and left and discharging dense, black clouds of smoke that disappeared slowly. There were moments when these black stretches of cloud seemed to form a frame round the aeroplanes, but the brave aviators knew how to escape from their assailants by all sorts of tricks. They came down to go up again unexpectedly, entirely changed their direction a moment later, and at last both disappeared undamaged. There seem to be three principal points aimed at in the very ingenious theory which we have endeavoured to summarise as adequately as space would permit. Zeller apparently wishes to bring Socrates into line with the great tradition of early Greek thought, to distinguish him markedly from the Sophists, and to trace back to his initiative the intellectual method of Plato and Aristotle. We cannot admit that the threefold attempt has succeeded. It seems to us that a picture into which so much Platonic colouring has been thrown would for that reason alone, and without any further objection, be open to very grave suspicion. But even accepting the historical accuracy of everything that Plato has119 said, or of as much as may be required, our critic’s inferences are not justified by his authorities. Neither the Xenophontic nor the Platonic Socrates seeks knowledge for its own sake, nor does either of them offer a satisfactory definition of knowledge, or, indeed, any definition at all. Aristotle was the first to explain what science meant, and he did so, not by developing the Socratic notion, but by incorporating it with the other methods independently struck out by physical philosophy. What would science be without the study of causation? and was not this ostentatiously neglected by the founder of conceptualism? Again, Plato, in the Theaetêtus, makes his Socrates criticise various theories of knowledge, but does not even hint that the critic had himself a better theory than any of them in reserve. The author of the Phaedo and the Republic was less interested in reforming the methods of scientific investigation than in directing research towards that which he believed to be alone worth knowing, the eternal ideas which underlie phenomena. The historical Socrates had no suspicion of transcendental realities; but he thought that a knowledge of physics was unattainable, and would be worthless if attained. By knowledge he meant art rather than science, and his method of defining was intended not for the latter but for the former. Those, he said, who can clearly express what they want to do are best secured against failure, and best able to communicate their skill to others. He made out that the various virtues were different kinds of knowledge, not from any extraordinary opinion of its preciousness, but because he thought that knowledge was the variable element in volition and that everything else was constant. Zeller dwells strongly on the Socratic identification of cognition with conduct; but how could anyone who fell at the first step into such a confusion of ideas be fitted either to explain what science meant or to come forward as the reformer of its methods? Nor is it correct to say that Socrates approached an object from every point of view, and took note of all its characteristic qualities. On the contrary, one would120 be inclined to charge him with the opposite tendency, with fixing his gaze too exclusively on some one quality, that to him, as a teacher, was the most interesting. His identification of virtue with knowledge is an excellent instance of this habit. So also is his identification of beauty with serviceableness, and his general disposition to judge of everything by a rather narrow standard of utility. On the other hand, Greek physical speculation would have gained nothing by a minute attention to definitions, and most probably would have been mischievously hampered by it. Aristotle, at any rate, prefers the method of Democritus to the method of Plato; and Aristotle himself is much nearer the truth when he follows on the Ionian or Sicilian track than when he attempts to define what in the then existing state of knowledge could not be satisfactorily defined. To talk about the various elements—earth, air, fire, and water—as things with which everybody was already familiar, may have been a crude unscientific procedure; to analyse them into different combinations of the hot and the cold, the light and the heavy, the dry and the moist, was not only erroneous but fatally misleading; it was arresting enquiry, and doing precisely what the Sophists had been accused of doing, that is, substituting the conceit for the reality of wisdom. It was, no doubt, necessary that mathematical terms should be defined; but where are we told that geometricians had to learn this truth from Socrates? The sciences of quantity, which could hardly have advanced a step without the help of exact conceptions, were successfully cultivated before he was born, and his influence was used to discourage rather than to promote their accurate study. With regard to the comprehensive all-sided examination of objects on which Zeller lays so much stress, and which he seems to regard as something peculiar to the conceptual method, it had unquestionably been neglected by Parmenides and Heracleitus; but had not the deficiency been already made good by their immediate successors? What else is the121 philosophy of Empedocles, the Atomists, and Anaxagoras, but an attempt—we must add, a by no means unsuccessful attempt—to recombine the opposing aspects of Nature which had been too exclusively insisted on at Ephesus and Elea? Again, to say that the Sophists had destroyed physical speculation by setting these partial aspects of truth against one another is, in our opinion, equally erroneous. First of all, Zeller here falls into the old mistake, long ago corrected by Grote, of treating the class in question as if they all held similar views. We have shown in the preceding chapter, if indeed it required to be shown, that the Sophists were divided into two principal schools, of which one was devoted to the cultivation of physics. Protagoras and Gorgias were the only sceptics; and it was not by setting one theory against another, but by working out a single theory to its last consequences, that their scepticism was reached; with no more effect, be it observed, than was exercised by Pyrrho on the science of his day. For the two great thinkers, with the aid of whose conclusions it was attempted to discredit objective reality, were already left far behind at the close of the fifth century; and neither their reasonings nor reasonings based on theirs, could exercise much influence on a generation which had Anaxagoras on Nature and the encyclopaedia of Democritus in its hands. There was, however, one critic who really did what the Sophists are charged with doing; who derided and denounced physical science on the ground that its professors were hopelessly at issue with one another; and this critic was no other than Socrates himself. He maintained, on purely popular and superficial grounds, the same sceptical attitude to which Protagoras gave at least the semblance of a psychological justification. And he wished that attention should be concentrated on the very subjects which Protagoras undertook to teach—namely, ethics, politics, and dialectics. Once more, to say that Socrates was conscious of not coming up to his own122 standard of true knowledge is inconsistent with Xenophon’s account, where he is represented as quite ready to answer every question put to him, and to offer a definition of everything that he considered worth defining. His scepticism, if it ever existed, was as artificial and short-lived as the scepticism of Descartes. If happiness consists in the appropriate exercise of our vital functions, then the highest happiness must result from the highest activity, whether we choose to call that reason or anything else which is the ruling and guiding principle within us, and through which we form our conceptions of what is noble and divine; and whether this be intrinsically divine, or only the divinest thing in us, its appropriate activity must be perfect happiness. Now this, which we call the theoretic activity, must be the mightiest; for reason is supreme in our souls and supreme over the objects which it cognises; and it is also the most continuous, for of all activities theorising is that which can be most uninterruptedly carried on. Again, we think that some pleasure ought to be mingled with happiness; if so, of all our proper activities philosophy is confessedly the most pleasurable, the enjoyments afforded by it being wonderfully pure and steady; for the existence of those who are in possession of knowledge is naturally more delightful than the existence of those who merely seek it. Of all virtues this is the most self-sufficing; for while in common with every other virtue it presupposes the indispensable conditions of life, wisdom does not, like justice and temperance and courage, need human objects for its exercise; theorising may go on in perfect solitude; for the co-operation of other men, though helpful, is not absolutely necessary to its activity. All other pursuits are exercised for some end lying outside themselves; war entirely for the sake of310 peace, and statesmanship in great part for the sake of honour and power; but theorising yields no extraneous profit great or small, and is loved for itself alone. If, then, the energising of pure reason rises above such noble careers as war and statesmanship by its independence, by its inherent delightfulness, and, so far as human frailty will permit, by its untiring vigour, this must constitute perfect human happiness; or rather such a life is more than human, and man can only partake of it through the divine principle within him; wherefore let us not listen to those who tell us that we should have no interests except what are human and mortal like ourselves; but so far as may be put on immortality, and bend all our efforts towards living up to that element of our nature which, though small in compass, is in power and preciousness supreme.192 The silence, cut by the nervous whispering of the children, became unendurable. "Are you very uneasy about them?" Mrs. Kirby asked. Where was he? He raised himself on his elbow, and immediately a head looked over the side of the cart. She lay propped high on the pillows, and he was astonished to see how well she looked, much better than before the baby was born. The infant George lay like a rather ugly doll on his grandmother's lap. He was not so healthy as the other children, indeed for a time it had been doubtful whether he would live. "It wur a pr?aper fight," he declared. "You want to manage them feet of yourn a bit slicker, f?ather—but you wur justabout smart wud your fists."www.822289.com.cn
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