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The prevailing custom of casting machine frames in one piece, or in as few pieces as possible, leads to a great deal of bar-boring, most of which can be performed accurately enough by boring bars supported in and fed through bearings. By setting up temporary bearings to support boring-bars, and improvising means of driving and feeding, most of the boring on machine frames can be performed on floors or sole plates and independent of boring machines and lathes. There are but few cases in which the importance of studying the principles of tool action is more clearly demonstrated than in this matter of boring; even long practical experience seldom leads to a thorough understanding of the [139] various problems which it involves.CHAPTER VIII SANDY MEETS A SUSPECT
  • THREE:A GLORIOUS summer evening, quite refreshing after the exhausting heat of the day. Nature invited to restfulness, and so much the more cruel sounded the incessant thunder of the guns, which also boomed from the citadel. As soon as the Germans had taken possession of this old, dilapidated fortress they proceeded to drag their guns on to it, and trained them on the surrounding forts.

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  • THREE:I felt very sick, for the sweet rye-bread which I had forced down my throat in the morning did not agree with me at all. At last I felt so ill that I162 was obliged to lie down on the floor of the car, and it took my colleague all his time to convince me that he did not think that my last hour had struck.

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  • THREE:If the earliest of Platos enquiries, while they deal with the same subjects and are conducted on the same method as those cultivated by Socrates, evince a breadth of view surpassing anything recorded of him by Xenophon, they also exhibit traces of an influence disconnected with and inferior in value to his. On more than one occasion121 Plato reasons, or rather quibbles, in a style which he has elsewhere held up to ridicule as characteristic of the Sophists, with such success that the name of sophistry has clung to it ever since.186 Indeed, some of the verbal fallacies employed are so transparent that we can hardly suppose them to be unintentional, and we are forced to conclude that the young despiser of human wisdom was resolved to maintain his thesis with any weapons, good or bad, which came to hand. And it seems much more likely that he learned the eristic art from Protagoras or from his disciples than from Socrates. Plato spent a large part of his life in opposing the Sophiststhat is to say, the paid professors of wisdom and virtue; but in spite of, or rather perhaps because of, this very opposition, he was profoundly affected by their teaching and example. It is quite conceivable, although we do not find it stated as a fact, that he resorted to them for instruction when a young man, and before coming under the influence of Socrates, an event which did not take place until he was twenty years old; or he may have been directed to them by Socrates himself. With all its originality, his style bears traces of a rhetorical training in the more elaborate passages, and the Sophists were the only teachers of rhetoric then to be found. His habit of clothing philosophical lessons in the form of a myth seems also to have been borrowed from them. It would, therefore, not be surprising that he should cultivate their argumentative legerdemain side by side with the more strict and severe discipline of Socratic dialectics.

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THREE:Whenever naturalism and scepticism have thus stood opposed, the result has been their transformation or absorption into a new philosophy, combining the systematic formalism of the one with the introspective idealism of the other. In Greece such a revolution had already been effected once before by Plato; and a restoration of his system seemed the most obvious solution that could offer itself on the present occasion. Such was, in fact, the solution eventually adopted; what we have to explain is why its adoption was delayed so long. For this various reasons may be offered. To begin with, the speculative languor of the age was unfavourable to the rise of a new school. Greece was almost depopulated by the demands of foreign service; and at Alexandria, where a new centre of Hellenism had been created, its best energies were absorbed by the cultivation of positive science. It was, no doubt, in great part owing to the dearth of ability that ideas which, at an earlier period, would have been immediately taken up and developed, were allowed to remain stationary for a hundred yearsthe interval separating a Carneades from an Arcesilaus. The regular organisation of philosophical teaching was another hindrance to progress. A certain amount of property was annexed to the headships of the different schools, and served as an endowment, not of research but of contented acquiescence in the received traditions. Moreover, the jealousy with which the professors of rival doctrines would naturally regard one another, was likely to prevent their mutual approximation from going beyond160 certain not very close limits, and might even lead to a still severer definition of the characteristic tenets which still kept them apart. Another and deeper disturbing force lay in the dissensions which, at a very early stage of its development, had split the spiritualistic philosophy into two opposing tendencies respectively represented by Plato and Aristotle. Any thinker who wandered away from the principles either of Stoicism or of Scepticism was more likely to find himself bewildered by the conflicting claims of these two illustrious masters, than to discern the common ground on which they stood, or to bring them within the grasp of a single reconciling system. Finally, an enormous perturbation in the normal course of speculation was produced by the entrance of Rome on the philosophical scene. But before estimating the influence of this new force, we must follow events to the point at which it first becomes of calculable importance.
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THREE:At Zeebrugge the conditions were not alarming. The houses of those who had gone away, however, had been damaged most terribly, and looted. Round the harbour guns were mounted, guarded by many sentries. I was at first forbidden to cross the canal bridge, but my excellent credentials at length made the sentries give in. Everything indicated that already during the first days of the occupation the Germans had begun to execute their plan to turn Zeebrugge into a station for submarines.Prout dutifully returned the following evening, but Lawrence had nothing fresh to offer. He still clung to his new theory, but it was not sufficiently developed for practical use. And he didn't want to be laughed at, he said.

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FORE:Forges, pneumatic machinery for blast, machinery for handling large pieces, and other details connected with forging, are easily understood from examples.

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FORE:VII.The sudden and varied resistance to line shafts tends to loosen couplings, destroy gearing, and produce sudden strains that are unknown in other cases; and shafting arranged with the usual proportions for transmitting power will soon fail if applied to driving trip-hammers. Rigid connections or metal attachments ace impracticable, and a slipping belt arranged so as to have the tension varied at will is the usual and almost the only successful means of transmitting power to hammers. The motion of trip-hammers is a curious problem; a head and die weighing, together with the irons for attaching them, one hundred pounds, will, with a helve eight feet long, strike from two to three hundred blows a minute. This speed exceeds anything that could be attained by a direct reciprocal motion given to the hammer-head by a crank, and far exceeds any rate of speed that would be assumed from theoretical inference. The hammer-helve being of wood, is elastic, and acts like a vibrating spring, its vibrations keeping in unison with the speed of the tripping points. The whole machine, in fact, must be constructed upon a principle of elasticity throughout, and in this regard stands as an exception to almost every other known machine. The framing for supporting the trunnions, which one without experience would suppose should be very rigid and solid, is found to answer best when composed of timber, and still better when this timber is laid up in a manner that allows the structure to spring and [107] yield. Starting at the dies, and following back through the details of a trip-hammer to the driving power, the apprentice may note how many parts contribute to this principle of elasticity: Firstthe wooden helve, both in front of and behind the trunnion; nextthe trunnion bar, which is usually a flat section mounted on pivot points; thirdthe elasticity of the framing called the 'husk,' and finally the frictional belt. This will convey an idea of the elasticity required in connecting the hammer-head with the driving power, a matter to be borne in mind, as it will be again referred to.

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FORE:Machinery can be divided into four classes, each constituting a division that is very clearly defined by functions performed, as follows:

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FORE:"drop it," Balmayne said rudely. "What's the good of that theatrical nonsense? If something is not done at once our plans are utterly ruined. Don't stand there like a tragedy actress, but suggest something.""Oh, but listen: my papers...."

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    FORE:The feed adjustment of the tool being intermittent and the amount of cutting continually varying, this movement should be performed by hand, so as to be controlled at will by the sense of feeling. The same rule applies to the adjustment of the rack for spacing; being intermittent and irregular as to time, this movement should also be performed by hand. The speed of the cutting movement is known from ordinary practice to be from sixteen feet to twenty feet a minute, and a belt two and a half inches wide must move two hundred feet a minute to propel an ordinary metal cutting tool, so that the crank movement or cutter movement must be increased by gearing until a proper speed of the belt is reached; from this the speed of intermediate movers will be found.
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    FORE:"At about nine o'clock of Friday evening, August 21st, German soldiers arriving by rail from Ciney marched into the town by the Rue Saint Jacques. They began to shoot into the windows without the slightest provocation, killed a workman who was on his way home, wounded another inhabitant and compelled him to call out: 'Long live the Kaiser.' A third they wounded in the abdomen with thrusts of their bayonets. They burst into the cafs, requisitioned all spirits, got tipsy on them, and left after setting several houses on fire and knocking to pieces the doors and windows of others.
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    FORE:
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    FORE:The faces of the dies remain parallel, no matter how large the piece may be that is operated upon, while with a trip-hammer, the top die moves in an arc described from the trunnions of the helve, and the faces of the dies can only be parallel when in one position, or when operating on pieces of a certain depth. This feature of parallel movement with the dies of crank-hammers is of great importance on some kinds of work, and especially so for machine-forgings where the size or depth of the work is continually being varied.
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    FORE:The majority of the refugees returning to Louvain belonged to the lower classes, and they began to loot and plunder the town, encouraged thereto by the German soldiers, who threw the things into the streets, and said: "Take it, if you like!" In extenuation of the looting and plundering I might say that the poor wretches tried before all to get hold of half-burned eatables.

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To us the religion of the Stoics is interesting chiefly as a part of the machinery by which they attempted to make good the connexion between natural and moral law, assumed rather than proved by their Sophistic and Cynic precursors. But before proceeding to this branch of the subject we must glance at their mode of conceiving another side of the fundamental relationship between man and the universe. This is logic in its widest sense, so understood as to include the theory of the process by which we get our knowledge and of the ultimate evidence on which it rests, no less than the theory of formal ratiocination."Amazing!" Charlton cried. "Why, these are my wife's diamonds, the real stones beyond doubt."
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