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Boring may be divided into three operations as follows: chuck-boring on lathes; bar-boring, when a boring bar runs on points or centres, and is supported at the ends only; and bar-boring when a bar is supported in and fed through fixed bearings. The principles are different in these operations, each one being applicable to certain kinds of work. A workman who can distinguish between these plans of boring, and can always determine from the nature of a certain work which is the best to adopt, has acquired considerable knowledge of fitting operations.

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It has also to be observed that the idea of utility as a test of moral goodness is quite distinct from hedonism. Plato proclaims, in the most unequivocal terms, that actions must be estimated by their consequences instead of by the feelings of sympathy or antipathy which they excite; yet no one could object more strongly to making pleasure the end of action. Thus, three distinct doctrines seem to converge in modern English ethics, of which all are traceable to Greek philosophy, but only one to Epicureanism in particular, and not ultimately to that but to the older systems whence it sprang.As we left through the Gate-of-Bruges towards242 Thourout we were approached by a small military group, a few German soldiers who escorted about a dozen French and Belgian prisoners of war. Until that moment the street had been relatively quiet, but the inhabitants had scarcely heard that the "boys" came, when each ran into the street, forgetting all fear of the "Duuts," and, breaking through the escort, they gave their "boys" an apple, or a pear, or a packet of cigarettes; so we saw a huge round of white bread fly through the air and land in the hands of one of the "boys." Such a thing touches one always, and even the escorting Germans, who at first were very indignant on account of the sudden and unexpected intrusion, left the citizens alone with a generous gesture, as to say: "Well, have your way."
ONE:An excellent plan to retain what is learned, is to make notes. There is nothing will assist the memory more in learning mechanics than to write down facts as they are learned, even if such memoranda are never referred to after they are made.
TWO:Hetty hesitated. It seemed hardly fair. And yet so much might depend upon her speaking. Nothing could save the Countess from arrest now. Rapidly, but clearly, she told Prout all that there was to tell. 更多 »
TWO:Leona Lalage came to the house at length. So far as she could see no lights were anywhere except in the hall, where there was a faint spot of gas. Everything was going to turn out favourably. Evidently the landlady had gone to bed, or the gas would not be so low. It was easy to pick the latchkey out of the bunch that she held in her hand. The lock turned easily and smoothly, and she was in the hall.
TWO:
TWO:Had some delivered in cans early this morningdown at the boathouse, Jeff told him. We can fill up the main tank and get a reserve in my small wing-tanksenough for ten hours altogether."Good night, my darling," he said, as he kissed her fondly. "You'll be compelled to leave here tomorrow, and I only hope the child will be better. Thank goodness, Gilbert Lawrence will be only too glad to have you."
TWO:Look here! Dick began to chuckle. Weve got a queer combination to work withour Sky Patrol has! Suspicious SandyandSuperstitious Jeff! Sandy grinned ruefully, a little sheepishly. Larry smiled and shook his head, warning Dick not to carry his sarcasm any further, as Jeff frowned.A pressure wheel, like a steam-engine, must include running contact between water-tight surfaces, and like a rotary steam-engine, this contact is between surfaces which move at different rates of speed in the same joint, so that the wear is unequal, and increases as the speed or the distance from the axis. When it is considered that the most careful workmanship has never produced rotary engines that would surmount these difficulties in working steam, it can hardly be expected they can be overcome in using water, which is not only liable to be filled with grit and sediment, but lacks the peculiar lubricating properties [41] of steam. A rotary steam-engine is in effect the same as a pressure water-wheel, and the apprentice in studying one will fully understand the principles of the other.
TWO:1. The distance to which power is to be transmitted.
TWO:Larry nodded in his calm, half-serious way.
TWO:Leona smiled with contempt as she surveyed the slim figure before her. She was always proud of her strength. She bared her beautiful white arm and showed the strong sinews and muscles under the skin.
TWO:Gravity, or "overshot" wheels, as they are called, for some reasons will seem to be the most effective, and capable of utilising the whole effect due to the gravity of the water; but in practice this is not the case, and it is only under peculiar conditions that wheels of this class are preferable to turbine wheels, and in no case will they give out a greater per cent. of power than turbine wheels of the best class. The reasons for this will be apparent by examining the conditions of their operation.

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If it were not for securing vent for gas, moulds could be made from plastic material so as to produce fine castings with clear sharp outlines.Under such guidance as this. Platonism had made but little way. We saw, in the concluding sections of the last chapter and in the opening section of the present chapter, that it profited by the religious and literary revival of the second century, just as it was to profit long afterwards by the greater revival of the fifteenth century, so much so as to become the fashionable philosophy of the age. Yet, even in that period of its renewed splendour, the noblest of contemporary thinkers was not a Platonist but a Stoic; and although it would be unfair to measure the moral distance between the Porch and the Academy by the interval which separates an Aurelius from an Apuleius, still it would seem as if naturalism continued to be the chosen creed of strenuous and dutiful endeavour, while spiritualism was drifting into an alliance with hysterical and sensuous superstition. If we may judge by the points which Sextus Empiricus selects for controversial treatment, Stoicism was still the reigning system in his time, that is to say, about the beginning of the third century; and if, a generation later, it had sunk into neglect, every rival school, except that of Epicurus, was in exactly the same condition. Thus the only advance made was to substitute one form of materialism for another, until Neo-Platonism came and put an end to their disputes by destroying the common foundation on which they stood; while, at the same time, it supplied a completely organised doctrine round which the nobler elements of the Hellenic revival could rally for a last stand against the foes that were threatening it from every side.49Spinoza gathered up all the threads of speculation thus made ready for his grasp, when he defined God as a substance consisting of infinite attributes, each of which expresses his infinite and eternal essence; subsequently adding that the essence here spoken of is Power, and that two of the infinite attributes are Extension and Thought, whereof the particular things known to us are modes. Platonism had decomposed the world into two ideal principles, and had re-created it by combining them over again in various proportions, but they were not entirely reabsorbed and worked up into the concrete reality which resulted from their union; they were, so to speak, knotted together, but the ends continued to hang loose. Above and below the finite sphere of existence there remained as an unemployed surplus the infinite causal energy of the One and the infinite passive potentiality of Matter. Spinoza combined and identified the two opposing elements in the notion of a single substance as infinite in actuality as they had been in power. He thus gave its highest metaphysical expression406 to that common tendency which we traced through the prospects opened out by the Copernican astronomy, the revival of Atomism, the dynamical psychology of Hobbes, and the illimitable passion of the Renaissance, while, at the same time, preserving the unity of Platos idealism, and even making it more concentrated than before.
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