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ENGLISH 136大桥未久下载CHAPTER XXV. CRANK-HAMMERS.(1.) Name some of the principal points to be kept in view in preparing designs?(2.) Why should attempts at designing be confined to one class of machinery?(3.) What objection exists to examining references when preparing designs?On Thursday everyone, even the persons staying in the Institution and hospitals, were ordered to leave the town, as it was to be shelled. They seemed to have no pity even on the wretched wounded men. Only the male and female nurses remained with these, of their own free will, determined to die with them if necessary.
An apprentice should never ask questions about simple and obvious matters, or about such things as he can easily learn by his own efforts. The more difficult a question is, the more pleasure a skilled man will take in answering it. In short, a learner should carefully consider questions before asking them. A good plan is to write them down, and when information is wanted about casting, never go to a foundry to interrupt a manager or moulder at melting time, nor in the morning, when no one wants to be annoyed with questions.(1.) If milling tools operate faster than planing or turning tools, why are they not more employed?(2.) How may the effect produced by cutting tools generally be computed?(3.) To what class of work are milling machines especially suited?(4.) Why do milling processes produce more accurate dimensions than are attainable by turning or planing?(5.) Why can some branches of manufacture be said to depend on milling processes?40
Later on I heard the same story from several other inhabitants. CHAPTER IXSecond.The steam establishes the greatest possible elasticity in the connection between a hammer and the driving power, and at the same time serves to cushion the blows at both the top and bottom of the stroke, or on the top only, as occasion may require.
It has been alleged that civilians had been shooting from the Halls, but when a committee examined the remains in the building with the consent of the military, they found there the carcase of a German horse. They were ordered to stop their investigations immediately, for that horse was evidence ... that German military men had been billeted on the building, and thus no civilians could have been there. This will also be published later in the reports.To sum up, it is supposed to have been determined by inductive reasoning, coupled with some knowledge of mechanics, that a steam hammer, to give a dead blow, requires the following conditions in the valve gearing:
I felt not the slightest inclination to go and see what was the matter, but I stretched myself and yawned, feeling much more tired after a couple of hours' rest than when I went to bed. The uproar went on, and suddenly I thought that I also heard a hubbub in the caf downstairs. And, really, it came ever nearer. People rushed up and down the stairs, screamed and yelled, doors were banged, in short it was as if they were pulling down the house.
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If 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."The burgomaster informs the population that any utterance contrary to the regulations will be severely punished.
What might happen next? Sitting on a chair in a corner of the room I began to consider my position. For the moment it was not agreeable, but by and by those officers might find time to look at my papers. The only thing I bothered about was a map marked with the places where, according to the latest news, the German and French armies were. I kept it in an inside coat-pocket, and it might be found if they should search me.
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