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    Software name: appdown
    Software type: Microsoft Framwork

    size: 524MB

    Lanuage:Englist

    Software instructions

      As remarked in the case of other machines treated of, there is no use of describing the mechanism of trip-hammers; it is presumed that every engineer apprentice has seen trip-hammers, or can do so; and the plan here is to deal especially with what he cannot see, and would not be likely to learn by casual observation.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.


      CHAPTER X. MACHINERY FOR TRANSMITTING AND DISTRIBUTING POWER.


      Sometimes I felt as if I were dreaming and wanted to call myself back from this nightmare to another, better, and real world. And I thought constantly of the man who, by one word, had given the order for these murders, this arson; the man who severed husbands and fathers, wives and mothers, and children, who caused so many innocent people to be shot, who destroyed the results of many, many years of strict economy and strenuous industry.

      There is, however, a principle in hydraulic machinery that must be taken into account, in comparing it with positively geared mechanism, which often leads to loss of power that in many cases will overbalance any gain derived from the peculiar action of hydraulic apparatus. I allude to the loss of power incident to dealing with an inelastic medium, where the amount of force expended is constant, regardless of the resistance offered. A hydraulic crane, for instance, consumes power in proportion to its movements, and not as the amount of duty performed; it takes the same quantity of water to fill the cylinders of such cranes, whether the water exert much or little force in moving the pistons. The difference between employing elastic mediums like air and steam, and an inelastic medium like water, for transmitting force in performing irregular duty, has been already alluded to, and forms a very interesting study for a student in mechanics, leading, as it does, to the solution of many problems concerning the use and effect of power.At the risk of laying down a proposition not warranted by science, I will mention, in connection with this matter of crystallisation, that metal when disposed in the form of a ring, for some strange reason seems to evade the influences which produce crystalline change. A hand-hammer, for example, may be worn away and remain fibrous; the links of chains and the tires of waggon wheels do not become crystallised; even the tires on locomotive wheels seem to withstand this influence, although the conditions of their use are such as to promote crystallisation.

      The sun was already setting, and became still redder, making still more abominable and more infernal the glare of the burning town. Nobody moved about in this abode of death.


      The lathe as a tool for producing heliacal forms would occupy a prominent place among machine tools, if it were capable of performing no other work; the number of parts of machinery which have screw-threads is astonishing; clamping-bolts to hold parts together include a large share of the fitting on machinery of all kinds, while screws are the most common means for increasing power, changing movements and performing adjustments.

      "Have they given you back everything?"It would be inferred that the arrangement of these double acting hammers must necessarily be complicated and expensive, but the contrary is the fact. The rams are simply two masses of iron mounted on wheels that run on ways, like a truck, and the impact of the hammers, so far as not absorbed in the work, is [114] neutralised by each other. No shock or jar is communicated to framing or foundations as in the case of single acting hammers that have fixed anvils. The same rule applies in the back stroke of the hammers as the links which move them are connected together at the centre, where the power is applied at right angles to the line of the hammer movement. The links connecting the two hammers constitute, in effect, a toggle joint, the steam piston being attached where they meet in the centre.

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      To avenge this alleged shooting by civilians the fires had been kindled in the houses, maxims placed in the streets, women and children beaten, men imprisoned or murdered.

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      "The municipal Government of Lige remind their fellow-citizens, and all staying within this city, that international law most strictly forbids civilians to commit hostilities against the German soldiers occupying the country.

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      A long time after I had left Belgium I got hold of the Black List, in which I am mentioned twice over among eighty-seven other persons; once as Hokveld-Journalist and again as Mokveld-Correspondent. The list was published by me in De Tijd of June 2nd, 1915.The quality of castings is governed by a great many things besides what have been named, such as the manner of gating or flowing the metal into the moulds, the temperature and quality of the iron, the temperature and character of the mouldthings which any skilled foundryman will take pleasure in explaining in answer to courteous and proper questions.


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