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ENGLISH 饥饿游戏综艺三上悠亚The time in which the contraction takes place is as the temperature of the bath and the cross section of the piece; in other words the heat passes off gradually from the surface to the centre."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...."
A finisher's engine lathe consists essentially of a strong inflexible shear or frame, a running spindle with from eight to sixteen changes of motion, a sliding head, or tail stock, and a sliding carriage to hold and move the tools.102Between Thienen and Louvain I met endless trains of refugees, exactly like those I had seen already near Vis, Lige, and other places. These also carried their wretched bundles, and children and young people did their utmost to encourage and support their elders on their arduous path. All these people saluted me in a cringing, timid manner, nodding smilingly and taking off their caps already from afar.
During the next days I found a hospitable domicile at the convent of the Sacred Heart on the Namur Canal ("Naamsche Vest"). It is a seminary for missionaries, and when I went to them for the first136 time I had a letter from their head, the "provincial" in The Netherlands, who sent the order that all the theological students should be transferred to The Netherlands as quickly as possible. They received me with the greatest kindness, and ever since I enjoyed their hospitality."Certainly, sister. Tell her that Bart of Uncle Henry is here." Again I was switched off, but the communication was this time restored after a few moments, and then I heard a joyful and surprised exclamation:
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They told this, while we were waiting on a couple of protruding boards of the pontoon-bridge, so as to allow some extremely wide carts to pass. Once again shells exploded, a couple of hundred yards behind us, and one made a hole in the bank quite near.
In practice, the truth of this proposition is fully demonstrated by the excess in the number of lathes and boring tools compared with those for planing.A drilling machine, adapted to the usual requirements of a machine fitting establishment, consists essentially of a spindle arranged to be driven at various speeds, with a movement for feeding the drills; a firm table set at right angles to the spindle, and arranged with a vertical adjustment to or from the spindle, and a compound adjustment in a horizontal plane. The simplicity of the mechanism required to operate drilling tools is such that it has permitted various modifications, such as column drills, radial drills, suspended drills, horizontal drills, bracket drills, multiple drills, and others.
In practice this difference of effect on the top and bottom, or between the anvil and hammer sides of a piece, is much greater than would be supposed. The yielding of the soft metal on the top cushions the blow and protects the under side from the force. The effect produced by a blow struck upon hot iron cannot be estimated by the force of the blow; it requires, to use a technical term, a certain amount of force to "start" the iron, and anything less than this force has but little effect in moving the particles and changing the form of a piece.Starting in the early morning of August 15th, I arrived at Vis without much trouble, after having been led across the Lixhe bridge once more. Since my first visit the bridge had been destroyed three times over, and this new one seemed very weak. As I stood there looking at it, a motor lorry had to cross it, and the bridge gave way near the bank. Another motor had then to pull the lorry up to the top of the bank, and this made the bridge give way still further.In the manufacture of machines, there are usually so many sizes and modifications, that drawings should assist and determine in a large degree the completeness of classification and record. Taking the manufacture of machine tools, for example: we cannot well say, each time they are to be spoken of, a thirty-six inch lathe without screw and gearing, a thirty-two inch lathe with screw and gearing, a forty-inch lathe triple geared or double geared, with a twenty or thirty foot frame, and so on. To avoid this it is necessary to assume symbols for machines of different classes, consisting generally of the letters of the alphabet, qualified by a single number as an exponent to designate capacity or different modifications. Assuming, in the case of engine lathes, A to be the symbol for lathes of all sizes, then those of different capacity and modification can be represented in the drawings and records as A1, A2, A3, A4, and so on, requiring but two characters to indicate a lathe of any kind. These symbols should be marked in large plain letters on the left-hand lower corner of sheets, so that the manager, workman, or any one else, can see at a glance what the  drawings relate to. This symbol should run through the time-book, cost account, sales record, and be the technical name for machines to which it applies; in this way machines will always be spoken of in the works by the name of their symbol.
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PREFACEIt may be noticed that all machines, except milling machines, which act in straight lines and produce plane surfaces have reciprocating movement; the class includes planing, slotting and shaping machines; these, with lathes, constitute nearly the whole equipment of an ordinary fitting shop.The invention is now complete, and as the principles are all within the scope of practical mechanism, there is nothing left to do but to devise such mechanical expedients as will carry out the principles laid down. This mechanical scheming is a second, and in some sense an independent part of machine improvement, and should always be subservient to principles; in fact, to separate mechanical scheming from principles, generally constitutes what has been called chance invention.
The general theory of their action may be explained in the following propositions:
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