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ENGLISH 波多野结衣下载2017Children and old people perished in consequence94 of the cruel heartlessness of the Germans, and in St. Hadelin College they robbed their own wounded of medical help and surgical appliances. CHAPTER VIIThe expense of patterns should be divided among and charged to the machines for which the patterns are employed, but there can be no constant rules for assessing or dividing this cost. A pattern may be employed but once, or it may be used for years; it is continually liable to be superseded by changes and improvements that cannot be predicted beforehand; and in preparing patterns, the question continually arises of how much ought to be expended on thema matter that should be determined between the engineer and the pattern-maker, but is generally left to the pattern-maker alone, for the reason that but few mechanical engineers understand pattern-making so well as to dictate plans of construction.

Examining machines made by the best designers, it will be found that their dimensions bear but little if any reference to calculated strains, especially in machines involving rapid motion. Accidents destroy constants, and a draughtsman or designer who does not combine special and experimental knowledge with what he may learn from general sources, will find his services to [89]be of but little value in actual practice.

The excellent man went on weeping, and I was not able to console him and did not know what to say. He took my arm, and led me to the large common hall, where twenty wounded Germans lay, who had been hit in the fight for the forts. He went to one bed after the other, and, with tears in his eyes, asked each man how he felt, and inquired, "Are you ... properly ... cared for ... here? Are you?" The sick men turned round, their eyes beamed, and they stammered words full of gratitude. Others said nothing, but took the Head's hand and pressed it long and warmly.Considered as a mechanical agent, a hammer concentrates the power of the arms, and applies it in a manner that meets the requirements of various purposes. If great force is required, a long swing and slow blows accomplish tons; if but little force is required, a short swing and rapid blows will servethe degree of force being not only continually at control, but also the direction in which it is applied. Other mechanism, if employed instead of hammers to perform a similar purpose, would require to be complicated [104] machines, and act in but one direction or in one plane.This object is attained in planing machines by the friction of the belts, which not only cushions the platen like a spring, but in being shifted opposes a gradually increasing resistance until the momentum is overcome and the motion reversed. By multiplying the movement of the platen with levers or other mechanism, and by reason of the movement that is attained by momentum after the driving power ceases to act, it is found practicable to have a platen 'shift its own belts,' a result that would never have been reached by theoretical deductions, and was no doubt discovered by experiment, like the automatic movement of engine valves is said to have been.

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The third plan of boring with bars resting in bearings is more extensively practised, and has the largest range of adaptation. A feature of this plan of boring is that the form of the boring-bar, or any imperfection in its bearings, is communicated to the work; a want of straightness in the bar makes tapering holes. This, of course, applies to cases where a bar is fed through fixed bearings placed at one or both ends of a hole to be bored. If a boring-bar is bent, or out of truth between its bearings, the diameter of the hole being governed by the extreme sweep of the cutters is untrue to the same extent, because as the cutters move along and come nearer to the bearings, the bar runs with more truth, forming a tapering hole diminishing toward the rests or bearings. The same rule applies to some extent in chuck-boring, the form of the lathe spindle being communicated to holes bored; but lathe spindles are presumed to be quite perfect compared with boring bars.

Some hints will now be given relating to apprentice experience in a workshop, such matters being selected as are most likely to be of interest and use to a learner.Whether neutral or foreigner, no one could help being deeply moved. Men and women, boys and girls, pressed once more through the German fence, just to shake hands with someone they had recognised. No wailing followed, but when hands were gripped, with a suppressed sob, they said:

To sum upWe have the following propositions in regard to moving and handling material:49

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The game of shooting and looting went on all through the night of the 20th. Not a window or door remained whole even if the house was not burned down altogether.CHAPTER XIII. GEARING AS A MEANS OF TRANSMITTING POWER.

After this game had been going on for some time, the order was given: "Everybody must come outside." Doors and windows were forced open and broken, and men, women, and children driven out of the houses. They were at once ruthlessly separated. Men who assisted their aged mothers, or carried their little babies, were taken away from their families, and driven away, leaving their wailing and weeping wives and children behind, while the flames from burning houses threw a lurid light on the sad scenes of that terrible evening.Irregularity of cooling may be the result of unequal conducting power in different parts of a mould or cores, or it may be [98] from the varying dimensions of the castings, which contain heat as their thickness, and give it off in the same ratio. As a rule, the drag or bottom side of a casting cools first, especially if a mould rests on the ground, and there is not much sand between the castings and the earth; this is a common cause of unequal cooling, especially in large flat pieces. Air being a bad conductor of heat, and the sand usually thin on the cope or top side, the result is that the top of moulds remain quite hot, while at the bottom the earth, being a good conductor, carries off the heat and cools that side first, so that the iron 'sets' first on the bottom, afterwards cooling and contracting on the top, so that castings are warped and left with inherent strains.

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