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    Software name: 彩票平台 代理返点 Appdown
    Software type: Microsoft Framwork

    Software size : 464 MB

    soft time:2021-02-26 03:43:39

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      Quickly he summoned an orderly and gave some orders, and a few minutes later four more officers drew round the table, on which a large map of Belgium was displayed. Their tone became at once charmingly sweet and kind, and a soldier offered me some lemonade from small bottles kept cool in a basin filled with cold water.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."Well, sir, not much beyond what you are sure to know already: that Japan declared war against Germany; that the Russians invaded Germany; that the French gained some important victories in Alsace; that the German fleet lost some ships...."

      If these various plans of arranging screw-cutting machines had reference to different kinds of work, it might be assumed that all of them are correct, but they are as a rule all applied to the same kind of work; hence it is safe to conclude that there is one arrangement better than the rest, or that one plan is right and the others wrong. This matter may in some degree be determined by following through the conditions of use and application.An old smith who has stood at the forge for a score of years will take the same interest in tempering processes that a novice will. When a piece is to be tempered which is liable to spring or break, and the risk is great, he will enter upon it with the same zeal and interest that he would have done when learning his trade.The force of gravity acts only in one direction—vertically, so that the main force of hoisting and handling machinery which opposes gravity must also act vertically, while the horizontal movement of objects may be accomplished by simply overcoming the friction between them and the surfaces on which they move. This is seen in practice. A force of a hundred pounds may move a loaded truck, which it would require tons to lift; hence the horizontal movements of material may be easily accomplished by hand with the aid of trucks and rollers, so long as it is moved on level planes; but if a weight has to be raised even a single inch by reason of irregularity in floors, the difference between overcoming frictional contact and opposing gravity is at once apparent.

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      "Oh yes, it has been destroyed already a couple of times, but we shall teach them a lesson! Why did not the Belgians allow us to pass through their country? What can their little army do against us? As soon as a sufficient number have crossed we shall go for these forts, then on to Brussels, and within a fortnight we shall be in Paris. Liège we have taken already."The principal improvements and changes in machine fitting at the present time is in the application of special tools. A lathe, a planing machine, or drilling machine as a standard machine, must be adapted to a certain range of work, but it is evident that if such tools were specially arranged for either the largest or the smallest pieces that come within their capacity, more work could be performed in a given time and consequently at less expense. It is also evident that machine tools must be kept constantly at work in order to be profitable, and when there are not sufficient pieces of one kind to occupy a machine, it must be employed on various kinds of work; but whenever there are sufficient pieces of the same size upon which certain processes of a uniform character are to be performed, there is a gain by having machines constructed to conform as nearly as possible to the requirements of special work, and without reference to any other.[160]

      Vertical handling, although it consumes more power, as a rule costs less, is more convenient, and requires less room than horizontal handling, which is sure to interfere more or less with the constructive operations of a workshop. In machine fitting there is generally a wrong estimate placed upon the value of ground floors, which are no doubt indispensable for the heaviest class of work, and for the heaviest tools; but with an ordinary class of work, where the pieces do not exceed two tons in weight, upper floors if strong are quite as convenient, if there is proper machinery for handling material; in fact, the records of any establishment, where cost accounts are carefully made up, will show that the expense of fitting on upper floors is less than on ground floors. This is to be accounted for by better light, and a removal of the fitting from the influences and interference of other operations that must necessarily be carried on upon ground floors."If you please."The names of many priests will be found in the register of Belgian martyrs. I have mentioned already some who, although innocent, gave their life for their country. During my week's stay at Louvain I heard of other cases. The priest of Corbeek-Loo, for example, was simply tortured to death on account of one of his sermons in which he said that the fight of the Belgian army was beauti142ful "because it lawfully resists an unlawful invasion," and further for announcing a Holy Requiem Mass for the souls of the "murdered" citizens.

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      In every quarter I met Belgian refugees from the south, and Netherlanders who wanted to escape to their safe native country. The Liège people themselves were not allowed to leave.To illustrate the practical application of what has preceded, let it be supposed, for example, that a machine is to be made for cutting teeth in iron racks ? in. pitch and 3 in. face, and that a design is to be prepared without reference to such machines as may already be in use for the purpose.

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      "Sister," I said then, "if you will only ask S?ur Eulalie to come to this gate she will recognise me, of course?"�[160]

      Shaping machines as machine tools occupy a middle place between planing and slotting machines; their movements correspond more to those of slotting machines, while the operation of the tools is the same as in planing. Some of the advantages of shaping over planing machines for certain kinds of work are, because of the greater facilities afforded for presenting and holding small pieces, or those of irregular shape; the supports or tables having both vertical and horizontal faces to which pieces may be fastened, and the convenience of the mechanism for adjusting and feeding tools.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.�

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      �"Certainly, captain; as a matter of fact we are of the same race."I have explained already in the chapter "Round about Liège" that I myself was duped occasionally, for example, by the story of the three hundred civilians who had been shot. To my mind these violent acts at the beginning of the war were part and parcel of the system of frightfulness, by which the Germans tried to scare the population and indirectly the hostile armies, at the same time rousing their own soldiers to anger and fury.

      In compression processes no material is cut away as in cutting or grinding, the mass being forced into shape by dies or forms that give the required configuration. The action of compressing machines may be either intermittent, as in the case of rolling mills; percussive, as in steam hammers, where a great force acts throughout a limited distance; or gradual and sustained, as in press forging. Machines of application, for abrading or grinding, are constantly coming more into use; their main purpose being to cut or shape material too hard to be acted upon by compression or by cutting processes. It follows that the necessity for machines of this kind is in proportion to the amount of hard material which enters into manufactures; in metal work the employment of hardened steel and iron is rapidly increasing, and as a result, grinding machines have now a place among the standard machine tools of a fitting shop.(1.) What peculiarity belongs to the operation of forging to distinguish it from most others?—(2.) Describe in a general way what forging operations consist in.—(3.) Name some machines having percussive action.—(4.) What may this principle of operating have to do with the framing of a machine?—(5.) If a steam-hammer were employed as a punching-machine, what changes would be required in its framing?—(6.) Explain the functions performed by a hand-hammer.It may be mentioned in regard to rack gearing for communicating movement to the carriages of planing machines or other purposes of a similar nature: the rack can be drawn to the wheel, and a lifting action avoided, by shortening the pitch of the rack, so that it will vary a little from the driving wheel. The rising or entering teeth in this case do not come in contact with those on the rack until they have attained a position normal to the line of the carriage movement.


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