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ENGLISH 苍井空青青的草原2017Pressure wheels, like gravity wheels, should, from theoretical inference, be expected to give a high per cent. of power. The water resting with the whole of its weight against the vanes or abutments, and without chance of escape except by turning the wheel, seems to meet the conditions of realising the whole effect due to the gravity of the water, and such wheels would no doubt be economical if they had not to contend with certain mechanical difficulties that render them impracticable in most cases.
Formerly an apprentice entered a shop to learn hand skill, and to acquaint himself with a number of mysterious processes; to learn a series of arbitrary rules which might serve to place him at a disadvantage even with those whose capacity was inferior and who had less education; but now the whole is changed. An engineer apprentice enters the shop with a confidence that he may learn whatever the facilities afford if he will put forth the required efforts; there are no mysteries to be solved; nearly all problems are reached and explained by science, leaving a greater share of the shop-time of a learner to be devoted to studying what is special.The attitude of all the soldiers changed immediately; they looked at me with angry eyes, and from time to time I heard hostile remarks. Whenever I did not walk quickly enough or turned a little to the right or the left, my escort pulled me roughly by the arm. All the same I took the case as coolly as possible, fully convinced that the commanding officer would release me after a superficial examination.
There was still a real reign of terror, and constantly the town-crier's bell was heard in the streets, informing the people that the victors required something or other. Only a few days ago it was announced that all bicycles had to be delivered at the bridge within twenty-four hours. Any person who after that time was found in possession of such a vehicle would be shot, and his house burned down. With similar threats all arms were requisitioned, but with the explicit addition that this referred also to old, and broken arms, or those which had been taken to pieces. Eatables and drinkables were also constantly claimed under threats of arson."PROCLAMATIONTwo South-American boys, about twelve years old, had stayed on and heroically assisted the Head at his charitable work. Dr. Goffin was not allowed to take anybody with him except these two children in his search for the wounded, and to bury the dead. It is scarcely credible how courageously these boys of such tender age behaved. Later the83 Chilean ambassador made inquiries about them and asked for their portraits.
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CHAPTER IPhysical strength, bone and muscle, must be elements in successful engineering experience; and if these things are not acquired at the same time with a mechanical education, it will be found, when ready to enter upon a course of practice, that an important element, the "propelling power," has been omitted.Owing to this difference in the manner of guiding and supporting the cutting edges, and the advantages of an axial support for tools in boring, it becomes an operation by which the most accurate dimensions are attainable, while drilling is a comparatively imperfect operation; yet the ordinary conditions of machine fitting are such that nearly all small holes can be drilled with sufficient accuracy.
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.Machine-drawing may in some respects be said to bear the same relation to mechanics that writing does to literature; persons may copy manuscript, or write from dictation, of what they do not understand; or a mechanical draughtsman may make drawings of a machine he does not understand; but neither such writing or drawing can have any value beyond that of ordinary labour. It is both necessary and expected that a draughtsman shall understand all the various processes of machine construction, and be familiar with the best examples that are furnished by modern practice.General engineering work cannot consist in the production of duplicate pieces, nor in operations performed constantly in the same manner as in ordinary manufacturing; hence there has been much effort expended in adapting machines to general purposesmachines, which seldom avoid the objections of combination, pointed out in a previous chapter.
The work of these sisters is the education of neglected children, and they spoke about their fears during the last momentous days. During the bombardment they stayed night and day with all those little ones in the heavily vaulted cellars of the nunnery, praying all the time before the Blessed Sacrament that had been removed from the chapel and taken into the cellar for safety.In every case where there can be a question as to whether gearing shafts or belts will be the best means of transmitting power, the several conditions named will furnish a solution if they are properly investigated and understood. Speed, noise, or angles may become determinative conditions, and are such in a large number of cases; first cost and loss of power are generally secondary conditions. Applying these tests to cases where belts, shafts, or wheels may be employed, a learner will soon find himself in possession of knowledge to guide him in his own schemes, and enable him to judge of the correctness of examples that come under his notice.
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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.The bridge-command at the pontoon-bridge near Lixhe allowed me to cross, after requesting me very pressingly to make very clear what swine these Belgians were, who fired so treacherously at unsuspecting soldiers, put out the eyes of the wounded, cut off their hands and genitals. When I asked where all these things had happened, the answer was: "Everywhere!" Of course, I promised them to do everything they wanted.
A second point to be noticed in hammers of this class is the nature of the connection with the driving power. In all cases there will be found an equivalent for the elastic helve of the trip-hammereither air cylinders, deflecting springs, or other yielding attachments,interposed between the crank and the hammer-head, also a slipping frictional belt or frictional clutches for driving, as in the case of trip-hammers.A bevel square is often convenient, but should be an independent one; a T square that has a movable blade is not suitable for general use. Combinations in draughting instruments, no matter what their character, should be avoided; such combinations, like those in machinery, are generally mistakes, and their effect the reverse of what is intended.Reciprocating tools are divided into those wherein the cutting movement is given to the tools, as in shaping and slotting machines, and machines wherein the cutting movement is given to the material to be planed, as in a common planing machine. Very strangely we find in general practice that machine tools for both the heaviest and the lightest class of work, such as shaping, and butting, operate upon the first principle, while pieces of a medium size are generally planed by being moved in contact with stationary tools.
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