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ENGLISH 波多野结衣最美的作品Impact wheels, or those driven by the percussive force of water, including the class termed turbine water-wheels, are at this time generally employed for heads of all heights.Grinding, no doubt, if traced to the principles that lie at the bottom, is nothing more than a cutting process, in which the edges employed are harder than any material that can be made into cutters, the edges firmly supported by being imbedded into a mass as the particles of sand are in grindstones, or the particles of emery in emery wheels.It is a simple affair, this putting up one's hands, but even at such a moment a free citizen has a strong objection against being compelled to this by others, who are no more than one's self, who ask it without any right, except the might derived from the weapon in their hands.
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assurance of the result until the work is felt by gauges."So this brave lady succeeded in getting the sentence of death withdrawn. But the Germans wanted to torture their wretched prisoners on any or no plea. They were placed near the church wall, kept standing there all night, were told that they would be shot by and by, and threatened by the soldiers with their bayonets.
The expense of patterns should be divided among and charged to the machines for which the patterns are employed, but there can be no constant rules for assessing or dividing this cost. A pattern may be employed but once, or it may be used for years; it is continually liable to be superseded by changes and improvements that cannot be predicted beforehand; and in preparing patterns, the question continually arises of how much ought to be expended on thema matter that should be determined between the engineer and the pattern-maker, but is generally left to the pattern-maker alone, for the reason that but few mechanical engineers understand pattern-making so well as to dictate plans of construction.Workshop processes which are capable of being systematised are the most easy to learn. When a process is reduced to a system it is no longer a subject of special knowledge, but comes within general rules and principles, which enable a learner to use his reasoning powers to a greater extent in mastering it."Well, that is right enough. But, mind, don't say in your paper that you found troops here, and especially avoid telling which troops."
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A good many soldiers were lying round about the high cement factory of Haccourt. The factory itself seemed to be used as a station for observations, for suddenly a voice roared from a top window: "Stop those people!" And we were stopped and taken to a small table where three officers were sitting drinking wine. The colonel asked for my papers, which he did not consider sufficient, as I had no passport from some German military authority. So I drew out again the bridge-commander's scrap of paper which said that I was permitted to go from Lixhe to Vis."All right, sir."Artistic drawing is addressed to the senses, geometrical drawing is addressed to the understanding. Geometrical drawing may, however, include artistic skill not in the way of ornamentation, but to convey an impression of neatness and completeness, that has by common custom been assumed among engineers, and which conveys to the mind an idea of competent construction in the drawing itself, as well as of the machinery which is represented. Artistic effect, so far as admissible in mechanical drawing, is easy to learn, and should be understood, yet through a desire to make pictures, a beginner is often led to neglect that which is more important in the way of accuracy and arrangement.
3. The strains to which shafts are subjected are the torsional strain of transmission, transverse strain from belts and wheels, and strains from accidents, such as the winding of belts.It is important, in asking questions, to consider the mood and present occupation of the person addressed; one question asked when a man's mind is not too much occupied, and when he is in a communicative humour, is worth a dozen questions asked when he is engaged, and not disposed to talk.
As I passed a Red Cross Hospital, partly spared, I noticed a Flemish doctor, who first looked at me from the door held ajar, and then came nearer; a strapping young fellow with a black beard. After I had made myself known as a Netherlander, he was clearly surprised, and it seemed as though he had a lot to ask or to tell. I expected to hear a torrent of abuse against the Huns, who had destroyed everything, and murdered so many innocent119 people, or a lament about the valuable treasures of the library, which also had not been spared; but no, other thoughts occupied his mind. With a slightly trembling voice he asked:At this point will occur one of those mechanical problems which requires what may be called logical solution. The valve must be moved by the drop; there is no other moving mechanism available; the valve and drop must besides be connected, to insure coincident action, yet the valve requires to move when the drop is still. Proceeding inductively, it is clear that a third agent must be introduced, some part moved by the drop, which will in turn move the valve, but this intermediate agent so arranged that it may continue to move after the hammer-drop has stopped.
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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.Chasing produces screws true with respect to their axis, and is the common process of threading all screws which are to have a running motion in use, either of the screw itself, or the nut.
"That way? But how did you get here then?"The bill-poster replied "yes" or "no" to my questions, whichever answer fitted, and as soon as he had finished his task he hurriedly trotted off. I did not see any other inhabitant.A learner who goes from gearing and shafts to steam and hydraulics, from machine tools to cranes and hoisting machinery, will not accomplish much. The best way is to select at first an easy subject, one that admits of a great range of modification, and if possible, one that has not assumed a standard form of construction. Bearings and supports for shafts and spindles,  is a good subject to begin with.
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