2021-04-18 11:30:15

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ENGLISH Some makers of steam-hammers have so perfected the automatic class, that they may be instantly changed so as to work with either dead blows or elastic blows at pleasure, thereby combining all the advantages of both principles. This brings the steam-hammer where it is hard to imagine a want of farther improvement.There was of course no gas lit, and there was no paraffin lamp in the house. I was shown to my room by the dim light of a candle. The old man could hardly get up the stairs, as he was trembling all over in consequence of the days passed in fear and dread. The ceiling of my bedroom had been pierced by bullets, and the fragments covered nearly the whole of the bed, which had not been made after it was last used. The unaccustomed work of stripping and making the bed was soon finished, and I was hardly ready when a soldier entered at the door, which had to be left open by order, and shouted from the bottom of the staircase that I was not allowed to have a light, and must blow out my candle."Papers? Papers? Yes, of course you all have papers; all those villains who shot at our men at Vis come back from The Netherlands with papers, in order to start afresh. Later on I'll have a look at that stuff. Here, lock him up for the present."

By what accident had I not been disturbed? The height, perhaps, at which my miserable little garret-room was situated.Fourth. The arrangement of the parts of a combination machine have to be modified by the relations between them, instead of being adapted directly to the work to be performed.

Just outside Tongres I met a fleet of Red Cross cars loaded with wounded. Cavalry escorted them. I was stopped and ordered to go back, as they expected the Belgians to attack Tongres.

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Symmetry, as an element in designs for machinery, is one of those unsettled matters which may be determined only in connection with particular cases; it may, however, be said that for all engineering implements and manufacturing machinery of every kind, there should be nothing added for ornament, or anything that has no connection with the functions of the machinery.

CHAPTER XXIII. FORGING.2. Drawings in true elevation or in section are based upon flat planes, and give dimensions parallel to the planes in which the views are taken.Suddenly several shots sounded in the neighbourhood. The three took their rifles and looked round, somewhat scared. They assured me that they would protect me. If there had been occasion for it, it would have been against their own comrades,117 for a troop of soldiers came sailing along, swinging about their rifles and shooting at the burning houses as they walked on, without rhyme or reason, anyhow and anywhere. These were drunk also. At last I was able to shake off my "friends," and got through another street into the market-place, at the town-hall and St. Peter's Church. The beautiful town-hall happily was not destroyed, as the first reports intimated, but St. Peter's had been damaged most cruelly. The spire had disappeared, the roof collapsed, windows broken, the altar burned, the pulpit badly damaged, and so forth. The two last-named parts were fine works of art.

The variation of dimensions which are sensible to the touch at one ten-thousandth part of an inch, furnishes an example of how important the human senses are even after the utmost precision attainable by machine action. Pieces may pass beneath the cutters of a milling machine under conditions, which so far as machinery avails will produce uniform sizes, yet there is no assurance of the result until the work is felt by gauges.A safe rule will be to assume that machinery mainly used and seen by the skilled should be devoid of ornament, and that machinery seen mainly by the unskilled, or in public, should have some ornament. Steam fire engines, sewing machines, and works of a similar kind, which fall under the inspection of the unskilled, are usually arranged with more or less ornament.Forging relates to shaping metal by compression or blows when it is in a heated and softened condition; as a process, it is an intermediate one between casting and what may be called the cold processes. Forging also relates to welding or joining [77] pieces together by sudden heating that melts the surface only, and then by forcing the pieces together while in this softened or semi-fused state. Forging includes, in ordinary practice, the preparation of cutting tools, and tempering them to various degrees of hardness as the nature of the work for which they are intended may require; also the construction of furnaces for heating the material, and mechanical devices for handling it when hot, with the various operations for shaping, which, as in the case of casting, can only be fully understood by experience and observation.

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105He looked for a moment at the spot where the deaths happened, from which the victims were carried away, and then suddenly asked in a kinder tone of voice:

The dear lady rapped it out in such a decided tone of voice that I desisted. I told my trouble to the proprietor of a caf where I took a glass of beer; he, examining my papers, placed confidence in me, and got me a rickety thing, for which I paid twenty-two francs.In cutting screws it is best not to refer to that mistaken convenience called a wheel list, usually stamped on some part of engine lathes to aid in selecting wheels. A screw to [127] be cut is to the lead screw on a lathe as the wheel on the screw is to the wheel on the spindle, and every workman should be familiar with so simple a matter as computing wheels for screw cutting, when there is but one train of wheels. Wheels for screw cutting may be computed not only quite as soon as read from an index, but the advantage of being familiar with wheel changes is very important in other cases, and frequently such combinations have to be made when there is not an index at hand.

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Apr-18 11:30:15