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Screw-cutting machines may be divided into modifications as follows:(1) Machines with running dies mounted in what is called the head; (2) Machines with fixed dies, in which motion is given to the rod or blank to be threaded; (3) Machines with expanding dies which open and release the screws when finished without running back; (4) Machines with solid dies, in which the screws have to be withdrawn by changing the motion of the driving gearing; making in all four different types.

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Finishing and fitting relates to giving true and accurate dimensions to the parts of machinery that come in contact with each other and are joined together or move upon each other, and consists in cutting away the surplus material which has to be left in founding and forging because of the heated and expanded condition in which the material is treated in these last processes. In finishing, material is operated upon at its normal temperature, in which condition it can be handled, gauged, or measured, and will retain its shape after it is fitted. Finishing comprehends all operations of cutting and abrading, such as turning, boring, planing and grinding, also the handling of material; it is considered the leading department in shop manipulation, because it is the one where the work constructed is organised and brought together. The fitting shop is also that department to which drawings especially apply, and other preparatory operations are usually made subservient to the fitting processes.He must have walked under a ladder, from the way things have turned out, he said, amusedly.
  • ONE:Bruce plunged into his story. He had a most interested listener. The small grey eyes of the listener were fixed intently on the narrator's face. The black cigar died out between his fingers. TWO:[29] Machinery of transmission.I was very curious to know what had happened in Veldwezelt. When I came near the village, I noticed great activity; men, women, and children were busy with saws and hatchets cutting down all the trees and shrubs along the road.

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  • ONE:"I will be guided entirely by you," he said. "You tell me that that vile woman will be punished, and I believe you. Strange that she should be mixed up with the lives of people you care for also. You must have been sure of your ground to let her escape you tonight."23 TWO:"Hullo!" I said, "but in those days I was in and about Maastricht, but I never noticed anything of it."

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  • ONE:The similarity of the operations carried on in all works directed to the manufacture of machinery, and the kind of knowledge that is required in planning and conducting such works, would lead us to suppose that at least as much system would exist in machine shops as in other manufacturing establishments, which is certainly not the case. There is, however, this difference to be considered: that whereas many kinds of establishments can be arranged at the beginning for a specific amount of business, machine shops generally grow up around a nucleus, and are gradually extended as their reputation and the demands for their productions increase; besides, the variety of operations required in an engineering establishment, and change from one class of work to another, are apt to lead to a confusion in arrangement, which is too often promoted, or at least not prevented, by insufficient estimates of the cost of handling and moving material. TWO:There was a score of guests in the drawing-room, all laughing and chatting together. Hetty was there also, looking, to Bruce's eyes, the sweetest and prettiest of them all. She owed nothing to artificial beauty."We did our utmost to the last, but it was impossible to go on."

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  • ONE:The clustering hair first gathered round his chin, TWO:Do you really believe anybody can be as superstitious as Jeff tries to make us believe he is?

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  • ONE:If, in the philosophy of Epicttus, physics and morality become entirely identified with religion, religion, on the other hand, remains entirely natural and moral. It is an offering245 not of prayer but of praise, a service less of ceremonies and sacrifices than of virtuous deeds, a study of conscience rather than of prophecy, a faith not so much in supernatural portents as in providential law.380 But in arriving at Marcus Aurelius, we have overstepped the line which divides rational religion from superstition. Instances of the good emperors astonishing credulity have already been given and need not be repeated. They are enough to show that his lavish expenditure on public worship was dictated by something more than a regard for established customs. We know, indeed, that the hecatombs with which his victories were celebrated gave occasion to profane merriment even in the society of that period. On one occasion, a petition was passed from hand to hand, purporting to be addressed to the emperor by the white oxen, and deprecating his success on the ground that if he won they were lost.381 Yet the same Marcus Aurelius, in speaking of his predecessor Antoninus, expressly specifies piety without superstition as one of the traits in his character which were most deserving of imitation.382 And, undoubtedly, the mental condition of those who were continually in an agony of fear lest they should incur the divine displeasure by some purely arbitrary act or omission, or who supposed that the gods might be bribed into furthering their iniquitous enterprises, was beyond all comparison further removed from true wisdom than the condition of those who believed themselves to be favoured by particular manifestations of the divine beneficence, perhaps as a recompense for their earnest attempts to lead a just and holy life. We may conclude, then, that philosophy, while injuriously affected by the supernaturalist movement, still protected its disciples against the more virulent forms of superstition, and by entering into combination with the popular belief, raised it to a higher level of feeling and of thought. It was not, however, by Stoicism that the final reconciliation of ancient religion with philosophy could be246 accomplished, but by certain older forms of speculation which we now proceed to study. TWO:A policeman was coming. He hailed the car. He could have no suspicion of its occupants as yet, he only sought information. Balmayne pulled the lever and the car started. The officer yelled instructions to somebody in the darkness; from point to point the message went along. There was no escape unless good luck stood on their side. And the motor was terribly swift.

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THREE:There was a light supper in the dining-room. Countess Lalage talked fitfully, from time to time glancing at the clock. The gilt hands were striding on towards a quarter to twelve.
THREE:There I would seek and win her for mine own.I did not want to witness that second attack, and, after thanking the officer, resumed my journey along the canal-road to Lige.

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THREE:Second.The steam establishes the greatest possible elasticity in the connection between a hammer and the driving power, and at the same time serves to cushion the blows at both the top and bottom of the stroke, or on the top only, as occasion may require.Under such guidance as this. Platonism had made but little way. We saw, in the concluding sections of the last chapter and in the opening section of the present chapter, that it profited by the religious and literary revival of the second century, just as it was to profit long afterwards by the greater revival of the fifteenth century, so much so as to become the fashionable philosophy of the age. Yet, even in that period of its renewed splendour, the noblest of contemporary thinkers was not a Platonist but a Stoic; and although it would be unfair to measure the moral distance between the Porch and the Academy by the interval which separates an Aurelius from an Apuleius, still it would seem as if naturalism continued to be the chosen creed of strenuous and dutiful endeavour, while spiritualism was drifting into an alliance with hysterical and sensuous superstition. If we may judge by the points which Sextus Empiricus selects for controversial treatment, Stoicism was still the reigning system in his time, that is to say, about the beginning of the third century; and if, a generation later, it had sunk into neglect, every rival school, except that of Epicurus, was in exactly the same condition. Thus the only advance made was to substitute one form of materialism for another, until Neo-Platonism came and put an end to their disputes by destroying the common foundation on which they stood; while, at the same time, it supplied a completely organised doctrine round which the nobler elements of the Hellenic revival could rally for a last stand against the foes that were threatening it from every side.

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THREE:"He did not die, woman. He was foully murdered."CHAPTER XIV

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THREE:The officer went on shaking his head at my answers, and I felt as if this might be the end of my fine little adventure. But I could not tell him that I had gone to Lige with that permit for Vis!Noting the causes and conditions which have led to this perfection in machine-tool manufacture, and how far they apply in the case of other classes of machinery, will in a measure indicate the probable improvements and changes that the future will produce.

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FORE:
FORE:"That dreadful headache has gone," the Countess cried. "I am myself again. We will dine quietly together, you and I, and go to hear Melba presently. Come, you can leave Mamie for just one night."
FORE:Some makers of steam-hammers have so perfected the automatic class, that they may be instantly changed so as to work with either dead blows or elastic blows at pleasure, thereby combining all the advantages of both principles. This brings the steam-hammer where it is hard to imagine a want of farther improvement.3. A knowledge of specific conditions, such as strains, the range and rate of movements, and so on.
FORE:"Lies, gossip? Ask the proprietor."
FORE:
FORE:40
FORE:"It's the fifth house," she said. "I shall trust to chance that the people are in bed. If not, I dare say I shall have a good tale to tell."
FORE:
FORE:

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For manufacturing processes, one importance of steam-power rests in the fact that such power can be taken to the material; and beside other advantages gained thereby, is the difference in the expense of transporting manufactured products and the raw material. In the case of iron manufacture, for example, it would cost ten times as much to transport the ore and the fuel used in smelting as it does to transport the manufactured iron; steam-power saves this difference, and without such power our present iron traffic would be impossible. In a great many manufacturing processes steam is required for heating, bleaching, boiling, and so on; besides, steam is now to a large extent employed for warming buildings, so that even when water or other power is employed, in most cases steam-generating apparatus has to be set up in addition. In many cases waste [31] steam or waste heat from a steam-engine can be employed for the purposes named, saving most of the expense that must be incurred if special apparatus is employed.Using the tramline was a bit of a risk, but Lalage took it. He wanted to be on familiar ground before his escape had been discovered. He had one object steadily in view, and after that was done he cared nothing. He came at length to a dismal looking road leading off Waterloo Bridge. Before what seemed an empty house he paused and knocked. A feeble gleam filtered in the fanlight and the door opened.The articles alluded to were suggested by observations made in actual practice, and by noting a "habit of thought" common among learners, which did not seem to accord with the purely scientific manner in which mechanical subjects are now so constantly treated.We have seen how Greek thought had arrived at a perfectly just conception of the process by which all physical transformations are effected. The whole extended universe is an aggregate of bodies, while each single body is formed by a combination of everlasting elements, and is destroyed by their separation. But if Empedocles was right, if these primary substances were no other than the fire, air, water, and earth of everyday experience, what became of the Heracleitean law, confirmed by common observation, that, so far from remaining unaltered, they were continually passing into one another? To this question the atomic theory gave an answer so conclusive, that, although ignored or contemned by later schools, it was revived with the great revival of science in the sixteenth century, was successfully employed in the explanation of every order of phenomena, and still remains the basis of all physical enquiry. The undulatory theory of light, the law of universal gravitation, and the laws of chemical combination can only be expressed in terms implying the existence of atoms; the laws of gaseous diffusion, and of thermodynamics generally, can only be understood with their help; and the latest develop34ments of chemistry have tended still further to establish their reality, as well as to elucidate their remarkable properties. In the absence of sufficient information, it is difficult to determine by what steps this admirable hypothesis was evolved. Yet, even without external evidence, we may fairly conjecture that, sooner or later, some philosopher, possessed of a high generalising faculty, would infer that if bodies are continually throwing off a flux of infinitesimal particles from their surfaces, they must be similarly subdivided all through; and that if the organs of sense are honeycombed with imperceptible pores, such may also be the universal constitution of matter.26 Now, according to Aristotle, Leucippus, the founder of atomism, did actually use the second of these arguments, and employed it in particular to prove the existence of indivisible solids.27 Other considerations equally obvious suggested themselves from another quarter. If all change was expressible in terms of matter and motion, then gradual change implied interstitial motion, which again involved the necessity of fine pores to serve as channels for the incoming and outgoing molecular streams. Nor, as was supposed, could motion of any kind be conceived without a vacuum, the second great postulate of the atomic theory. Here its advocates directly joined issue with Parmenides. The chief of the Eleatic school had, as we have seen, presented being under the form of a homogeneous sphere, absolutely continuous but limited in extent. Space dissociated from matter was to him, as afterwards to Aristotle, non-existent and impossible. It was, he exclaimed, inconceivable, nonsensical. Unhappily inconceivability is about the worst negative criterion of truth ever yet invented. His challenge was now35 taken up by the Atomists, who boldly affirmed that if non-being meant empty space, it was just as conceivable and just as necessary as being. A further stimulus may have been received from the Pythagorean school, whose doctrines had, just at this time, been systematised and committed to writing by Philolaus, its most eminent disciple. The hard saying that all things were made out of number might be explained and confirmed if the integers were interpreted as material atoms.
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