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    Software name: appdown
    Software type: Microsoft Framwork

    size: 766MB

    Lanuage:Englist

    Software instructions

      In conclusion, I will say on the subject of patterns and castings, that a learner must depend mainly upon what he can see and what is explained to him in the pattern-shop and foundry. He need never fear an uncivil answer to a proper question, applied at the right time and place. Mechanics who have enough knowledge to give useful information of their business, have invariably the courtesy and good sense to impart such information to those who require it.



      CHAPTER I

      To an experienced mechanic a single glance at the tools on a lathe is a sufficient clue to the skill of the operator. If the tools are ground ready to use, of the proper shape, and placed in order so as to be reached without delay, the latheman may at once be set down as having two of the main qualifications of a first-class workman, which are order, and a knowledge of tools; while on the contrary, a lathe board piled full of old waste, clamp bolts, and broken tools, shows a want of that system and order, without which no amount of hand skill can make an efficient workman."But are you sure? Where are the French now, and where did the British land?"

      CHAPTER VIII


      It is never enough to know that any piece of work is commonly constructed in some particular manner, or that a proposition is generally accepted as being correct; a reason should be sought for. Nothing is learned, in the true sense, until the reasons for it are understood, and it is by no means sufficient to know from observation alone that belts are best for high speeds, that gearing is the best means of forming angles in transmitting power, or that gearing consumes more power, and that belts produce less jar and noise; the principles which lie at the bottom must be reached before it can be assumed that the matter is fairly understood.

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      A planing machine with a running platen occupies nearly twice as much floor space, and requires a frame at least one-third longer than if the platen were fixed and the tools performed the cutting movement. The weight which has to be traversed, including the carriage, will in nearly all cases exceed what it would be with a tool movement; so that there must exist some very strong reasons in favour of a moving platen, which I will now attempt to explain, or at least point out some of the more prominent causes which have led to the common arrangement of planing machines.I have in this way imperfectly indicated a methodical plan of generating a design, as far as words alone will serve, beginning with certain premises based upon a particular work to be performed, and then proceeding to consider in consecutive order the general character of the machine, mode of operation, movements and adjustments, general arrangement, strains, special arrangement, and proportions.

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      There is much in Mr. Mokveld's narrative to interest the historian. For example, he gives a 6 fuller account than we have yet had of that obscure period when Lige had fallen, but its northern forts were still holding out. But it is less a history of the campaign than a chronicle of those lesser incidents of war which reveal the character of the combatants. No more crushing indictment of German methods has been issued, the more crushing since it is so fair and reasonable. The author has very readily set down on the credit side any act of German humanity or courtesy which he witnessed or heard of. But the credit side is meagre and the black list of crimes portentous. Episodes like the burning of Vis and the treatment of British prisoners in the train at Landen would be hard to match in history for squalid horror.

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      And during these first days of the war I had not met a single person who was able to settle down quietly in the existing circumstances, not a single person in whom anger and fury subdued fear and terror.


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