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ENGLISH 苍井空影片大全aHe was back in The Netherlands before me.7. The effect of pneumatic machinery in reducing insurance rates and danger of fire.(1.) Why have belts been found better than shafts for transmitting power through long distances?(2.) What are the conditions which limit the speed of belts?(3.) Why cannot belts be employed to communicate positive movement?(4.) Would a common belt transmit motion positively, if there were no slip on the pulleys?(5.) Name some of the circumstances to be considered in comparing belts with gearing or shafts as a means of transmitting power.
102"If you please."If it were not for securing vent for gas, moulds could be made from plastic material so as to produce fine castings with clear sharp outlines.
Cutting, as a process in converting material, includes the force to propel cutting edges, means to guide and control their action, and mechanism to sustain and adjust the material acted upon. In cutting with hand tools, the operator performs the two functions of propelling and guiding the tools with his hands; but in what [58] is called power operations, machines are made to perform these functions. In nearly all processes machines have supplanted hand labour, and it may be noticed in the history and development of machine tools that much has been lost in too closely imitating hand operations when machines were first applied. To be profitable, machines must either employ more force, guide tools with more accuracy, or move them at greater speed, than is attainable by hand. Increased speed may, although more seldom, be an object in the employment of machinery, as well as the guidance of implements or increased force in propelling them. The hands of workmen are not only limited as to the power that may be exerted, and unable to guide tools with accuracy, but are also limited to a slow rate of movement, so that machines can be employed with great advantage in many operations where neither the force nor guidance of tools are wanting.
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I had great trouble to make her understand that I was a Netherlander; and that changed at once her opinion for the Germans. She told me then that her husband and children had fled to The Netherlands, as had most of the inhabitants, and29 that she was left behind merely because she dawdled too long. And now she was constantly afraid that they might fire her house as they did the others, and murder her ... for such had been the fate of several of the villagers. Even whole families had been killed.Tempering, as a term, is used to comprehend both hardening and drawing; as a process it depends mainly upon judgment instead of skill, and has no such connection with forging as to be performed by smiths only. Tempering requires a different fire from those employed in forging, and also more care and precision than blacksmiths can exercise, unless there are furnaces and baths especially arranged for tempering tools.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.
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.
"In agreement with the German Military authority I invite the inhabitants of Louvain to return to the city, and to take up again their usual occupations.I also asked the inn-keeper whether he felt no fear in those surroundings. But, shrugging his shoulders, he answered: "All we can do is to wait quietly. I do all in my power to keep them in a good temper, give them beer and cigars, and yesterday killed one of my two cows for them. I may have lost everything at the end of the war, ... but even so, let it be, if I can only save the life of my family and keep a roof over my head. But my anxiety is great enough, for, you understand, I have two daughters ... and ... and...."
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I was now escorted to a spot where on some straw several soldiers were sleeping, who had to do sentry-go at two o'clock that night. It was a part of the platform which was not even roofed, and entirely under the open sky. But they anyway had straw to lie on, and sufficient cover, but I had to lie down between them on the flags, without any blanket. A separate sentry was commanded to watch me; every two hours another was charged with the task. I was allowed to try and sleep, with the warning that I should be shot at the slightest attempt to escape.On the road from Borgloon to Thienen I had a chat with an old crone, who stood weeping by the ruins of her miserable little cottage, which she refused to leave. This little house, which strenuous zeal had enabled her to buy, was all she possessed on earth besides her two sons, both fallen through the murderous lead of those barbarians, and buried in the little garden at the back of their ruined home. Of another family, living close by, the father and two sons were murdered in the same way.43 "Oh! Bart, is it you?"
One thing more must be noticed, a matter of some intricacy, but without which, all that has been explained would fail to give a proper idea of steam-hammer-action. The valve motions are alluded to.Connected with screw dies, there are various problems, such as clearance behind the cutting edge; whether an odd or even number of edges are best; how many threads require to be bevelled at the starting point; and many other matters about which there are no determined rules. The diversity of opinion that will be met with on these points, and in reference to taps, the form of screw-threads, and so on, will convince a learner of the intricacies in this apparently simple matter of cutting screw-threads.
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