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Cores are employed mainly for what may be termed the displacement of metal in moulds. There is no clear line of distinction between cores and moulds, as founding is now conducted; cores may be of green sand, and made to surround the exterior of a piece, as well as to make perforations or to form recesses within it. The term 'core,' in its technical sense, means dried moulds, as distinguished from green sand. Wheels or other castings are said to be cast in cores when the moulds are made in pieces and dried. Supporting and venting cores, and their expansion, are conditions to which especial attention [95] is called. When a core is surrounded with hot metal, it gives off, because of moisture and the burning of the 'wash,' a large amount of gas which must have free means of escape. In the arrangement of cores, therefore, attention must be had to some means of venting, which is generally attained by allowing them to project through the sides of the mould and communicate with the air outside.What a chase! Speed was in their favor, because the seaplane, fast as it was, lacked the power of their engine which they learned later that Jeff had selected for that very quality.
Expose
ONE:"Don't laugh at me, Gordon," Hetty whispered. "I knew there was something wrong with that dreadful corner house. You have heard of the tragedy?"

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TWO:Quick to take it, dipping a wing and kicking rudder, the seaplanes pilot swerved a little, leveled off, and set down in a smother of foam, and on his wing also a man climbed close to the tip!

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TWO:After having murdered the burgomaster's wife, the villains attacked a guest, Mr. Derricks, a lawyer, and member of the Provincial States, whom they killed with a bayonet. His wife broke a leg when she tried to fly to the cellar.

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TWO:Where was she to find the matches, for she had none of her own? She fumbled her way to the fireplace, but could find nothing she required. It seemed to her that she could hear somebody breathing in the room besides herself. But this she put down to the worn and disordered state of her nerves.

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TWO:"How slow you are," she said. "Where does anything happen that touches on this case? And I know where there was some heavy gambling going on last night. The incident took place in the drawing-room of No. 1, Lytton Avenue.""The police service will be performed in the daytime by some volunteers, who will wear an armlet in the municipal colours, and an identity card, both officially stamped. Well-minded persons, who are willing to perform these duties, are urgently requested to present themselves at the town-hall to-day at four o'clock in the afternoon.

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TWO:
FORE:

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FORE:That was a relief! I began to translate, taking the liberties to which every translator is entitled. And I succeeded in making a favourable impression by censoring my own manuscript."Have you got papers?"

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FORE:"Now is your chance," he said. "It is a pretty neat turn of fortune for us. I've got the motor round and will meet you at the corner of the street. You had better be disguised."

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FORE:They girt with towers and sheltering houses raised,"8. Liberate prisoners of war.

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FORE:139"What time would that be?" Bruce asked as casually as possible.

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FORE:Through a thin cleft in the heavy mist, not far below them the dark outlines of eel-grass, flanking two sides of a channel in the swampy shore line stood out, for an instant, clear and menacing.

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FORE:

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FORE:On the day of my visit to Ostend all sorts of conveyances had taken more than 3,000 wounded into the town. Peasants from the neighbourhood were compelled to harness their horses and transport the unfortunate men. Such a procession was distressing to look at, as most men lay on open carts, only supported by a handful of newly cut straw, and long processions entered the town continuously. As reinforcements had arrived, the divisions of the German army which had suffered most came sometimes from the front to the town, in order241 to have a rest, and then I saw a great deal of misery.

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FORE:

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TWO:"Should telegraph- or telephone-wires be cut in the neighbourhood of towns and villages, these places will be sentenced to pay a war-contribution, whether the inhabitants are guilty or not.In compression processes no material is cut away as in cutting or grinding, the mass being forced into shape by dies or forms that give the required configuration. The action of compressing machines may be either intermittent, as in the case of rolling mills; percussive, as in steam hammers, where a great force acts throughout a limited distance; or gradual and sustained, as in press forging. Machines of application, for abrading or grinding, are constantly coming more into use; their main purpose being to cut or shape material too hard to be acted upon by compression or by cutting processes. It follows that the necessity for machines of this kind is in proportion to the amount of hard material which enters into manufactures; in metal work the employment of hardened steel and iron is rapidly increasing, and as a result, grinding machines have now a place among the standard machine tools of a fitting shop.

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THREE:But the ageless order he seesThe first impressions an apprentice forms of the smith-shop as a department of an engineering establishment is that it is a black, sooty, dirty place, where a kind of rough unskilled labour is performeda department which does not demand much attention. How far this estimate is wrong will appear in after years, when experience has demonstrated the intricacies and difficulties of forging, and when he finds the skill in this department is more difficult to obtain, and costs more relatively than in any other. Forging as a branch of work requires, in fact, the highest skill, and is one where the operation continually depends upon the judgment of the workman, which neither power nor machines can to any extent supplant. Dirt, hard labour, and heat deter men from learning to forge, and create a preference for the finishing shop, which in most places makes a disproportion between the [102] number of smiths and finishers.

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THREE:As reading books of fiction sometimes expands the mind and enables it to grasp great practical truths, so may a study of abstract principles often enable us to comprehend the simplest forms of mechanism. Even Humboldt and Agassiz, it is said, [32] resorted sometimes to imaginative speculations as a means of enabling them to grasp new truths.
TWO:

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Another distinguished compliment was paid to Plotinus after his death by no less an authority than the Pythian Apollo, who at this period had fully recovered the use of his voice. On being consulted respecting the fate of the philosophers soul, the god replied by a flood of bombastic twaddle, in which the glorified spirit of Plotinus is described as released from the chain of human necessity and the surging uproar of the body, swimming stoutly to the storm-beaten shore, and mounting the heaven-illumined path, not unknown to him even in life, that leads to the blissful abodes of the immortals.423After much searching, we have not been able to find the originals of the two passages quoted by Sir A. Grant. We have, however, found others setting forth the doctrine of Natural Realism with a clearness which leaves nothing to be desired. Aristotle tells us that former naturalists were wrong when they said that there could be no black or white without vision, and no taste without tasting; that is, they were right about the actuality, and wrong about the possibility; for, as he explains, our sensations are produced by the action of external bodies on the appropriate organs, the activity being the same while the existence is different. A sonorous body produces a sound in our hearing; the sound perceived and the action of the body are identical, but not their existence; for, he adds, the hearer need not be always listening, nor the sonorous body sounding; and so with all the other senses.267First I will notice that among our many books upon mechanical subjects there are none that seem to be directed to the instruction of apprentice engineers; at least, there are none directed to that part of a mechanical education most difficult to acquire, a power of analysing and deducing conclusions from commonplace matters.Balmayne danced down the lane with impotent fury. Despite her peril and the fear that was in her heart, Hetty smiled. Here was a daring and audacious rascal engaged in some desperate and, no doubt, cunning scheme who was utterly baffled by a mere girl and a hairpin.Another condition of apprenticeship that is equally as difficult to define as the commercial value of mechanical knowledge, or that of apprentice labour, is the extent and nature of the facilities that different establishments afford for learners.
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