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ENGLISH 波多野结衣当众被辱CHAPTER XI. SHAFTS FOR TRANSMITTING POWER.97

1. The distance to which power is to be transmitted.The hotel where I stayed that night was called H?tel de la Paix; an hotel of peace, indeed!

It will be well for an apprentice to begin at once, as soon as he commences a shop course, to note the manner of handling material, watching the operation of cranes, hoists, trucks, tackle, rollers; in short, everything that has to do with moving and handling. The machinery and appliances in ordinary use are simple enough in a mechanical sense, but the principles of handling material are by no means as plain or easy to understand. The diversity of practice seen in various plans of handling and lifting weights fully attests the last proposition, and it is questionable whether there is any other branch of mechanical engineering that is treated less in a scientific way than machinery of this class. I do not allude to the mechanism of cranes and other devices, which are usually well proportioned and generally well arranged, but to the adaptation of such machinery with reference to special or local conditions. There are certain inherent difficulties that have to be encountered in the construction and operation of machinery, for lifting and handling, that are peculiar to it as a class; among these difficulties is the transmission of power to movable mechanism, the intermittent and irregular application of power, severe strains, also the liability to accidents and breakage from such machinery being controlled by the judgment of attendants.A few minutes after I left the town a scene drew my attention. A lady stood there with a little girl; the lady seemed to urge the child to do something to which it objected. She refused to take a bag full of various small parcels pressed upon her, and clutched hold of the lady's skirts. I wanted to know what was the matter, got a little nearer, and was amazed to hear them both speak Netherland. I could not help asking what the trouble was and whether I might be of service.

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To follow out the application of power to the propulsion of vessels and trains, with the many abstruse problems that would of necessity be involved, would be to carry this work far beyond the limits within which it is most likely to be useful to the apprentice engineer; besides, it would be going beyond what can properly be termed manipulation.For the moment all they knew was that the Germans were in the town, as none of them yet had ventured outside the building. At present their great fear was that Germans might be billeted on them.... Oh! they might take everything if only they did not come themselves."The burgomaster informs the population that any utterance contrary to the regulations will be severely punished.

The mission house had become a sanctuary for a good many people. As bread was lacking, two brothers fried pancakes all day long and distributed them among the numberless persons who asked for food. Among these were people who a few days earlier belonged to the well-to-do, but who saw their business, in which often more than their own capital was invested, wrecked by fire, and were now obliged to appeal to the charity of these monks. Indeed during the first weeks after that terrible event many starved, and I assisted often at the distribution of the pancakes, because they were short-handed.The officer went on shaking his head at my answers, and I felt as if this might be the end of my fine little adventure. But I could not tell him that I had gone to Lige with that permit for Vis!In the same way the list went on for a goodly length, and he became actually angry when even then I refused to believe everything. He was especially pleased with the account of the victory near Libramont. He had a friend, also a physician, who had been compelled by the Germans to go with them in the medical service, and this friend had told him this himself. It was remarkable that educated, superior persons could become so narrow-minded in times like these, and believed anything simply because they hoped that it might be true.

For compasses, the lead points should be cylindrical, and fit into a metal sheath without paper packing or other contrivance to hold them; and if a draughtsman has instruments not arranged in this manner, he should have them changed at once, both for convenience and economy.At seven o'clock in the evening I entered Lige; and so far I had achieved my end.

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4. Mechanical drawings should be made with reference to all the processes that are required in the construction of the work, and the drawings should be responsible, not only for dimensions, but for unnecessary expense in fitting, forging, pattern-making, moulding, and so on.

Machine motion is mainly rotary; and as rotary motion is accomplished by cylindrical parts such as shafts, bearings, pulleys and wheels, we find that the greater share of machine tools are directed to preparing cylindrical forms. If we note the area of the turned, bored and drilled surface in ordinary machinery, and compare with the amount of planed surface, we will find the former not less than as two to one in the finer class of machinery, and as three to one in the coarser class; from this may be estimated approximately the proportion of tools required for operating on cylindrical surfaces and plane surfaces; assuming the cutting tools to have the same capacity in the two cases, the proportion will be as three to one. This difference between the number of machines required for cylindrical and plane surfaces is farther increased, when we consider that tools act continually on cylindrical surfaces and intermittently on plane surfaces.(1.) Why is the effect produced different on the top and bottom of a piece when struck by a hammer?(2.) Why does not a compound hammer create jar and concussion?(3.) What would be a mechanical difficulty in presenting the material to such hammers?(4.) Which is most important, speed or weight, in the effect produced on the under side of pieces, when struck by single acting hammers?

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Apr-22 05:41:13