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    Software name: appdown
    Software type: Microsoft Framwork

    size: 325MB

    Lanuage:Englist

    Software instructions

      The Germans had flung some more bridges across the river beyond Andenne, which had been used for the occupation of Namur chiefly, and lay idle now guarded by only one sentry. I left by the town-gate without any difficulties; the German soldiers jumped out of the way and stood to atten153tion, as soon as they noticed the Netherland flag flying at the front of the motor. To the right and the left of the gateway they had written in gigantic letters: "Newspapers, please!"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.


      I walked about a little longer to examine the damage done. The fine Pont des Arches was for the greater part destroyed by the retreating Belgians, as well as the Pont Maghin. This is a pity, especially as regards the first-named bridge, so famous as a work of art, and the more so as other bridges had not been touched and could be used by the Germans. The bombardment did not damage the town to any great extent, but it was remarkable that the largest houses had suffered most.An excellent plan to retain what is learned, is to make notes. There is nothing will assist the memory more in learning mechanics than to write down facts as they are learned, even if such memoranda are never referred to after they are made.


      There was a little more order in the whole district round Lige, since the Germans behaved more decently, and provisions had arrived. The shock, which the burning and butchering of so many places and persons gave to the whole world, had also influenced the conduct of the Germans, and from the beginning of September they made a practice of asking each time when they thought that they had behaved decently: "Well, are we such barbarians as the world calls us?"I had to listen to a prolonged hymn of praise of the Netherlanders, who were such sensible people, and the best friends of the Germans; protestations which did not interest me in the least at that moment. On the contrary, it struck me as deplorable that this man did not say a single word of his own accord about the horrible thing happening close by: the destruction of an entire community! He did not seem to attach any importance to it....

      "Could you ever have thought ... that ... that ... such ... a cruel ... fate would overwhelm us? What crime did these poor people commit? Have we not given all we had? Have we not strictly obeyed their commands? Have we not done more than they asked for? Have we not charitably nursed their wounded in this House? Oh! they profess deep gratitude to me. But ... why then? There is nothing left in the House for the aged refugees whom we admitted, for the soldiers we nurse; our doctor has been made a prisoner and taken away, and we are without medical help. This is nothing for the Sisters and myself, but all these unfortunate creatures ... they must have food...."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 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.She looked me up and down suspiciously, and then said:


      Designing is in many respects the same thing as invention, except that it deals more with mechanism than principles, although it may, and often does include both. Like invention, designing should always be attempted for the attainment of some definite object laid down at the beginning, and followed persistently throughout.

      The terrified little sister was unable to stammer anything more, and in great fear suddenly closed the little shutter again.Marine and railway engineering have engrossed the best talent in the world; investigation and research has been expended upon these subjects in a degree commensurate with their importance, and it would be hard to suggest a single want in the many able text-books that have been prepared upon the subjects. Marine and railway engineering are sciences that may, in a sense, be separated from the ordinary constructive arts, and studied at the end of a course in mechanical engineering, but are hardly [61] proper subjects for an apprentice to take up at the beginning.

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      Different kinds of gearing can be seen in almost every engineering establishment, and in view of the amount of scientific information available, it will only be necessary to point out some of the conditions that govern the use and operation of the different kinds of wheels. The durability of gearing, aside from breaking, is dependent upon pressure and the amount of rubbing action that takes place between the teeth when in contact. Spur wheels, or bevel wheels, when the pitch is accurate and the teeth of the proper form, if kept clean and lubricated, wear but little, because the contact between the teeth is that of rolling instead of sliding. In many cases, one wheel of a pair is filled with wooden cogs; in this arrangement there are four objects, to avoid noise, to attain a degree of elasticity in the teeth, to retain lubricants by absorption in the wood, and to secure by wear a better configuration of the teeth than is usually attained in casting, or even in cutting teeth.Handling and moving material is the principal matter to be considered in the arrangement of engineering works. The constructive manipulation can be watched, estimated, and faults detected by comparison, but handling, like the designs for machinery, is a more obscure matter, and may be greatly at fault without its defects being apparent to any but those who are highly skilled, and have had their attention especially directed [73] to the matter.

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      Forging relates to shaping metal by compression or blows when it is in a heated and softened condition; as a process, it is an intermediate one between casting and what may be called the cold processes. Forging also relates to welding or joining [77] pieces together by sudden heating that melts the surface only, and then by forcing the pieces together while in this softened or semi-fused state. Forging includes, in ordinary practice, the preparation of cutting tools, and tempering them to various degrees of hardness as the nature of the work for which they are intended may require; also the construction of furnaces for heating the material, and mechanical devices for handling it when hot, with the various operations for shaping, which, as in the case of casting, can only be fully understood by experience and observation."Devant-le-Pont?"

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      The officer assured me that a new effort would be made soon, as they were commanded to take Pontisse and Lierce at any price, the seventh and ninth regiment of foot-artillery of Cologne being selected for the purpose.


      alllittle