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ENGLISH 小苍井空的视频迅雷下载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.
A little farther on a few houses were left undamaged, because they stood outside the town proper. A woman who had remained in her house stood outside with cigar-boxes under her arm. She offered cigars from an open box to the soldiers of the passing divisions. To me she seemed to be out of her mind, as she stood there trembling, her face distorted from hypernervousness. Her cringing kindness was of no avail, for I noticed a couple of days afterwards that her house too had been totally destroyed.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.
In respect to the difference between expanding and solid dies it consists mainly in the time required to run back, and the injury to dies which this operation occasions. Uniformity of  size is within certain limits insured by solid dies, but they are more liable to derangement and less easy to repair than expanding or independent dies.5. The loss of power during transmission.
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Nor did I see any inhabitants in the burning78 town. It was practically impossible to stay in the streets; burning walls and roofs and gutters crashed down with a great noise, so that the streets were as much on fire as the houses themselves. Only at the crossings were any soldiers to be seen, who, in various stages of intoxication, constantly aimed at the burning houses, and shot everything that tried to escape from the burning stables and barns: pigs, horses, cows, dogs, and so on.Without any wish to discourage the ambition of an apprentice to invent, which always inspires him to laudable exertion, it is nevertheless best to caution him against innovations. The estimate formed of our abilities is very apt to be inversely as our experience, and old engineers are not nearly so confident in their deductions and plans as beginners are.
Very many other cases of martyrdom among priests remained unknown to me, but the various Belgian bishops examined all these events with praiseworthy zeal and scrupulousness, and by taking extensive evidence established the fact that in no case the victims could be reproached with any act that justified the sentence against them. After the war the world will surely be made acquainted with the horrible truth.At Fort Pontisse or Lierce they seemed to have noticed that the factory was a station for observation. As the officer was still thinking about my case, one of those infernal monster shells crashed down among a group of soldiers, only some yards away. Those who were not hit ran away, but they came back soon, and took up seven or eight comrades, whom they carried into the factory. I shuddered when I saw what had happened, and through the shock the sight gave me I involuntarily jerked my arms.In metal working, owing to a more perfect division of labour, and a more intelligent manipulation than in wood-working, there is less combination in machinesin fact, a combination machine for metal work is rarely seen at this day, and never under circumstances where it occasions actual loss. The advantage of combination, as said, can only be in the framing and floor space occupied by the machines, but these considerations, to be estimated by a proper standard, are quite insignificant when compared with other items in the cost of machine operating, such as the attendance, interest on the invested cost of the machine, depreciation of value by wear, repairing, and so on.
A true movement of carriages is dependent upon the amount or wearing power of their bearing surface, how this surface is disposed in reference to the strain to be resisted, and the conditions under which the sliding surfaces move; that is, how kept in contact. The cutting strain which is to be mainly considered, falls usually at an angle of thirty to forty degrees downward toward the front, from the centre of the lathe. To resist such strain a flat top shear presents no surface at right angles to the strain; the bearings are all oblique, and not only this, but all horizontal strain falls on one side of the shear only; for this reason, flat top shears have to be made much heavier than would be required if the sum of their cross section could be employed to resist transverse strain. This difficulty can, however, be mainly obviated by numerous cross girts, which will be found in most lathe frames having flat tops.
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The road along which I walked, the main road between Vis and Lige, was laid under fire from various forts, and every moment I saw on my left clouds rise up from the rocky heights that run along the whole of the Meuse. These clouds were partly formed by smoke from the guns mounted by the Germans against the forts, partly by volumes of earth thrown up by the projectiles from the broken-up soil.
CHAPTER XXXII. SLOTTING MACHINES.
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