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ENGLISH 波多野结衣群番号I did not feel very comfortable after what had happened to those soldiers who lost their lives so cruelly sudden, or in any case had been seriously wounded, while the officers took little notice of them. But it was desirable to behave as discreetly as possible, and so to get a permit to Maastricht.

During the night only a few houses were burnt down; the general destruction followed the next morning, Sunday, August 16th, and just as I reached the little town the flames were raging all over the place in a fierce blaze.As soon as I heard about the horrors that took place at Louvain, I hastened to try and get there to find out, if possible, by personal observation the truth of the numberless conflicting stories that would undoubtedly grow up from the facts. I expected that the situation round about the town would be rather critical, and decided to proceed cautiously. It is rather a long stretch of nearly forty-five miles, but I succeeded in getting to Louvain in the afternoon.I think proper to point out these peculiarities, not so much from any importance they may have in themselves, but to suggest critical investigation, and to dissipate any preconceived opinions of forging being a simple matter, easy to learn, and involving only commonplace operations.

13054If a cutting movement were performed by the tool supports, it would necessarily follow that the larger a piece to be planed, and the greater the distance from the platen to the cutting point, the farther a tool must be from its supports; a reversal of the conditions required; because the heavier the work the greater the cutting strain will be, and the tool supports less able to withstand the strains to be resisted.

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130The sudden and varied resistance to line shafts tends to loosen couplings, destroy gearing, and produce sudden strains that are unknown in other cases; and shafting arranged with the usual proportions for transmitting power will soon fail if applied to driving trip-hammers. Rigid connections or metal attachments ace impracticable, and a slipping belt arranged so as to have the tension varied at will is the usual and almost the only successful means of transmitting power to hammers. The motion of trip-hammers is a curious problem; a head and die weighing, together with the irons for attaching them, one hundred pounds, will, with a helve eight feet long, strike from two to three hundred blows a minute. This speed exceeds anything that could be attained by a direct reciprocal motion given to the hammer-head by a crank, and far exceeds any rate of speed that would be assumed from theoretical inference. The hammer-helve being of wood, is elastic, and acts like a vibrating spring, its vibrations keeping in unison with the speed of the tripping points. The whole machine, in fact, must be constructed upon a principle of elasticity throughout, and in this regard stands as an exception to almost every other known machine. The framing for supporting the trunnions, which one without experience would suppose should be very rigid and solid, is found to answer best when composed of timber, and still better when this timber is laid up in a manner that allows the structure to spring and [107] yield. Starting at the dies, and following back through the details of a trip-hammer to the driving power, the apprentice may note how many parts contribute to this principle of elasticity: Firstthe wooden helve, both in front of and behind the trunnion; nextthe trunnion bar, which is usually a flat section mounted on pivot points; thirdthe elasticity of the framing called the 'husk,' and finally the frictional belt. This will convey an idea of the elasticity required in connecting the hammer-head with the driving power, a matter to be borne in mind, as it will be again referred to.

Professor Noyons took me all over the hospital, and if I should describe all I saw and heard there, that story alone would fill volumes. He took me, for example, to a boy of eight years old, whose shoulder was shattered by rifle-shots. His father and140 mother, four little brothers and a sister, had been murdered. The boy himself was saved because they thought that he was dead, whereas he was only unconscious. When I asked for his parents, brothers and sister, he put up his one hand and, counting by his little fingers, he mentioned their names.I roamed about aimlessly in a scorching heat. Whither? I did not know myself. I did not know Louvain and met nobody whom I might ask something. I came near a couple of streets that were only ruins; the walls collapsed against each other and filled the roadway with rubbish, so that sometimes I could not see whether I walked on or beside the place where the houses used to stand."Why not, sir?" I asked.

CHAPTER XIV. HYDRAULIC APPARATUS FOR TRANSMITTING POWER."What?"

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The extreme nicety with which gauging implements are fitted seems at first thought to be unnecessary, but it must be remembered that a cylindrical joint in ordinary machine fitting involves a precision almost beyond the sense of feeling, and that any sensible variation in turning gauges is enough to spoil a fit.40Let the reader compare a hammer with a wheel and axle, inclined plane, screw, or lever, as an agent for concentrating and applying power, noting the principles of its action first, and then considering its universal use, and he will conclude that, if there is a mechanical device that comprehends distinct principles, that device is the common hammer. It seems, indeed, to be one of those provisions to meet a human necessity, and without which mechanical industry could not be carried on. In the manipulation of nearly every kind of material, the hammer is continually necessary in order to exert a force beyond what the hands may do, unaided by mechanism to multiply their force. A carpenter in driving a spike requires a force of from one to two tons; a blacksmith requires a force of from five pounds to five tons to meet the requirements of his work; a stonemason applies a force of from one hundred to one thousand pounds in driving the edge of his tools; chipping, calking, in fact nearly all mechanical operations, consist more or less in blows, such blows being the application of accumulated force expended throughout a limited distance.

Expedients to avoid dirt in such castings as are to be finished all over or on two sides are various. Careful moulding to avoid loose sand and washing is the first requisite; sinking heads, that rise above the moulds, are commonly employed when castings are of a form which allows the dirt to collect at one point. Moulds for sinking heads are formed by moulders as a rule, but are sometimes provided for by the patterns.

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