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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.A search was being made for the fugitives in every place but the right one. The railings of the square were high, so that it never occurred to any one that the culprits might have escaped that way. They had got off somehow. In the opinion of most of the people there they had stopped the motor and started it again on its headlong course, after which they had mingled with the crowd.
ONE:Leona Lalage laughed aloud. She threw back her head, and a few drops from the little bottle were tilted between her teeth. Almost instantly she grew livid.
TWO:"We won't bother about the drawing-room," Hetty said gaily. "That can take care of itself for the present. Two fans and a bulrush as somebody says. And the other rooms, so long as they are light, won't matter. But the dining-room must be quite the thing. Oh, if you could only afford to get the lovely oak we saw at Capper's! We must think of you alone, just at first, Gordon." 更多 »
TWO:The term application has been selected as a proper one to distinguish machines that expend and apply power, from those that are employed in generating or transmitting power. Machines of application employed in manufacturing, and which expend their action on material, are directed to certain operations which are usually spoken of as processes, such as cutting, compressing, grinding, separating, and disintegrating.
TWO:The rules for distinguishing between truth and falsehood98 are given in the famous Epicurean Canon. On receiving an image into the mind, we associate it with similar images formerly impressed on us by some real object. If the association or anticipation (πρ?ληψι?) is confirmed or not contradicted by subsequent experience, it is true; false, if contradicted or not confirmed.187 The stress laid on absence of contradictory evidence illustrates the great part played by such notions as possibility, negation, and freedom in the Epicurean system. In ethics this class of conceptions is represented by painlessness, conceived first as the condition, and finally as the essence of happiness; in physics by the infinite void, the inane profundum of which Lucretius speaks with almost religious unction; and in logic by the absence of contradiction considered as a proof of reality. Here, perhaps, we may detect the Parmenidean absolute under a new form; only, by a curious reversal, what Parmenides himself strove altogether to expel from thought has become its supreme object and content.188By the time they sighted the hangar and field, he had all the bits joined perfectly. Sandys solution fitted every point that he knew, and was so water tight and so beautiful that he landed with his face carrying its first really satisfied, and exultant grin.
TWO:I think it did! challenged Larry. We thought we saw somebody at the back of the hangarthats why we came in! Im going to see where he is, what hes doing and why hes trying to frightfrighten us!Strains suggest special arrangement, which is quite a distinct matter from general arrangement, the latter being governed mainly by the convenience of manipulation. Special arrangement deals with and determines the shape of framing, following the strains throughout a machine. In the present case we have a cutting strain which may be assumed as equal to one ton, exerted between the bracket or jaws which support the work, and the crank-shaft. It follows that between these two points the metal in the framing should be disposed in as direct a line as possible, and provision be made to resist flexion by deep sections parallel with the cutting motion.
TWO:Another and profounder characteristic of Plato, as distinguished from Aristotle, is his thorough-going opposition of reality to appearance; his distrust of sensuous perception, imagination, and opinion; his continual appeal to a hidden world of absolute truth and justice. We find this profounder principle also grasped and applied to poetical purposes in our Elizabethan literature, not only by Spenser, but by a still greater masterShakespeare. It is by no means unlikely that Shakespeare may have looked into a translation of the Dialogues; at any rate, the intellectual atmosphere he breathed was so saturated with their spirit that he could easily absorb enough of it to inspire him with the theory of existence which alone gives consistency to his dramatic work from first to last. For the essence of his comedies is that they represent the ordinary world of sensible experience as a scene of bewilderment and delusion, where there is nothing fixed, nothing satisfying, nothing true; as something which, because of its very unreality, is best represented by the drama,371 but a drama that is not without mysterious intimations of a reality behind the veil. In them we have the
TWO:Lets get busy! urged Sandy.
TWO:Turning from sense to reason, Carneades attacks the syllogistic process on grounds already specified in connexion150 with the earlier Sceptics; and also on the plea that to prove the possibility of syllogism is itself to syllogise, and thus involves either a petitio principii or a regress ad infinitum.235 Such a method is, of course, suicidal, for it disproves the possibility of the alleged disproof, a consideration which the Stoics did not fail to urge, and which the later Sceptics could only meet by extending the rule of suspense to their own arguments against argument.236 Nevertheless the sceptical analysis detected some difficulties in the ordinary theory of logic, which have been revived in modern times, and have not yet received any satisfactory solution. Sextus Empiricus, probably copying an earlier authority, it may be Carneades himself, observes that, as the major premise of every syllogism virtually contains the minor, it is either superfluous, or assumes the proposition to be proved. Thus we argue that Socrates is an animal because he is a man, and all men are animals. But if we do not know this latter proposition to be true in the case of Socrates, we cannot be sure that it is true in any case; while if we know it to be true in his case, we do not need to begin by stating it in general terms. And he also attempts to show the impossibility of a valid induction by the consideration, since so often urged, that to generalise from a limited number of instances to a whole class is unsafe, for some of the unknown instances may be contradictory, while the infinite, or at least indefinite multiplicity of individuals precludes the possibility of their exhaustive enumeration.237The philosophical affinities of the new science were not exhausted by the atomistic analysis of Democritus and the regulative method of Aristotle. Platonism could hardly fail to benefit by the great impulse given to mathematical studies in the latter half of the sixteenth century. The passionate love of its founder for geometry must have recommended him as much to the most advanced minds of the period as his religious mysticism had recommended him to the theologians of the earlier Renaissance. And the increasing ascendency of the heliocentric astronomy, with its splendid defiance of sense and opinion, was indirectly a triumph for the philosophy which, more than any other, had asserted the claims of pure reason against both. We see this distinctly in Galileo. In express adhesion to Platonism, he throws his teaching into a conversational form, endeavouring to extract the truth from his opponents rather than convey it into their minds from without; and the theory of reminiscence as the source of demonstrative knowledge seems to meet with his approval.549 He is always ready with proofs drawn from observation and experiment; but nothing can be more in Platos spirit, nothing more unlike Aristotle and Bacon, than his encomium on the sublime genius of Aristarchus and Copernicus for having maintained a rational hypothesis against what seemed to be the evidence of their senses.550 And he elsewhere observes how much less would have been the glory of Copernicus had he known the experimental verification of his theory.551
TWO:The passions themselves, and the means by which they can be either excited or controlled, are described in Aristotles Rhetoric with wonderful knowledge of human nature in the abstract, but with almost no reference to the art for whose purposes the information is ostensibly systematised; while in the Ethics they are studied, so to speak, statically, in their condition of permanent equilibration or disequilibration; the virtues and vices being represented as so many different396 aspects of those conditions. It is obvious that such an extremely artificial parallelism could not be carried out without a considerable strain and distortion of the facts involved. The only virtue that can, with truth, be described as a form of moderation is temperance; and even in temperance this is accidental rather than essential. Elsewhere Aristotle deduces the extremes from the mean rather than the mean from the extremes; and sometimes one of the extremes is invented for the occasion. To fit justice, confessedly the most important virtue, into such a scheme, was obviously impracticable without reinterpreting the idea of moderation. Instead of an equilibrium between opposing impulses in the same person, we have equality in the treatment of different persons; which again resolves itself into giving them their own, without any definite determination of what their own may be.289 It cannot even be said that Aristotle represented either the best ethical thought of his own age, or an indispensable stage in the evolution of all thought. The extreme insufficiency of his ethical theory is due to the fancied necessity of squaring it with the requirements of his cosmological system. For no sooner does he place himself at the popular point of view than he deduces the particular virtues from regard to the welfare of others, and treats them all as so many different forms of justice.290
TWO:"Are they bad?" Lady Longmere asked quizzically?With Socrates and Plato, scepticism exhibits itself under two new aspects: as an accompaniment of religious belief, and as an element of constructive thought. Thus they represent both the good and the bad side of this tendency: the aspect under which it is a help, and the aspect under which it is a hindrance to scientific investigation. With both philosophers, however, the restriction or negation of human knowledge was a consequence rather than a cause of their theological convictions; nor do they seem to have appreciated its value as a weapon in the controversy with religious unbelief. When Socrates represented the irreconcilable divergence in the explanations of Nature offered by previous thinkers as a sufficient condemnation of their several pretensions, he did not set this fact against the arguments by which a Xenophanes had similarly endeavoured to overthrow the popular mythology; but he looked on it as a fatal consequence of their insane presumption in meddling with the secrets of the gods. On one occasion only, when explaining to Euthydmus that the invisibility of the gods is no reason for doubting their existence, he argues, somewhat in Butlers style, that our own minds, whose existence we cannot doubt, are equally invisible.222 And the Platonic Socrates makes it134 his business to demonstrate the universality of human ignorance, not as a caution against dogmatic unbelief, but as a glorification of the divine knowledge; though how we come to know that there is any such knowledge he leaves utterly unexplained.

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312The difference between hand and machine operations, and the labour-saving effect of machines, will be farther spoken of in another place; the subject is alluded to here, only to enable the reader to more fully distinguish between machinery of transmission and machinery of application. Machinery of application, directed to what has been termed compression processes, such as steam hammers, drops, presses, rolling mills, and so on, act upon material that is naturally soft and ductile, or when it is softened by heat, as in the case of forging.Whenever our escort fancied that they saw something, they stopped and called out to the supposed approaching persons: "Who goes there?" Some125times it was only some shrubs that they saw; at other times patrolling German soldiers. "Parole?" was asked: "Duisburg!" and after that answer they came nearer. At the station I was taken to an officer who sat at a table on the platform and had lit up his nearest surroundings by means of a paraffin-lamp. My little old man wept now so badly that he was quite unmanageable, and the officer made up his mind to get rid of him as quickly as possible.Finishing as a process is a secondary and not always an essential one; many parts of machinery are ready for use when forged or cast and do not require fitting; yet a finishing shop must in many respects be considered the leading department of an engineering establishment. Plans, drawings and estimates are always based on finished work, and when the parts have accurate dimensions; hence designs, drawings and estimates may be said to pass through the fitting shop and follow back to the foundry and smith shop, so that finishing, although the last process in the order of the work, is the first one after the drawings in every other sense; even the dimensions in pattern-making which seems farthest removed from finishing, are based upon fitting dimensions, and to a great extent must be modified [119]by the conditions of finishing.
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