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This brings us back to the old proposition, that for structures which do not involve motion, mathematical data will furnish dimensions; but the same rule will not apply in machinery. To follow the proportions for shafts that would be furnished by pure mathematical data would in nearly all cases lead to error. Experience has demonstrated that for ordinary cases, where power is transmitted and applied with tolerable regularity, a shaft three inches in diameter, making one hundred and fifty revolutions a minute, its bearings three to four diameters in length, and placed ten feet apart, will safely transmit fifty horse-power.

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With wind unchanged the trees which had complicated their landing were behind them. Jeffs only problem, Larry saw, was to get the craft, heavier with its wing tanks full, off the short runway and over the hangar.The addition of a few questions at the end of each chapter, some of which are not answered in the text, it is thought will assist the main object of the work, which is to promote a habit of logical investigation on the part of learners.VII.
 
ONE:The Everdail Emeralds! Larry repeated the phrase sharply. Why, Jeff! Ive read a newspaper story about them, in a Sunday supplement. Thats the matched set of thirty emeralds

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TWO:

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TWO:Maitrank, in his shirtsleeves, was smoking one of his black cigars. He made no apology for his attire nor for the rank tobacco between his yellow teeth. How different the last time when they had met in the millionaire's office."That child's noise makes my head ache," she said.
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FORE:Strains suggest special arrangement, which is quite a distinct matter from general arrangement, the latter being governed mainly by the convenience of manipulation. Special arrangement deals with and determines the shape of framing, following the strains throughout a machine. In the present case we have a cutting strain which may be assumed as equal to one ton, exerted between the bracket or jaws which support the work, and the crank-shaft. It follows that between these two points the metal in the framing should be disposed in as direct a line as possible, and provision be made to resist flexion by deep sections parallel with the cutting motion.

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FORE:"Kill him," urged the Countess. "Kneel down and pin that wrap over his face. He is an old man, and the drug has affected his heart. He will go off quietly in his sleep. Then you can throw him down the well in the courtyard of the Corner House."

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FORE:I do think you ought to explain! Larry said quietly.

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FORE:It would seem from this singular and touching expression of gratitude that the deathless idealism of Hellas found in Neros gift of a nominal liberty ample compensation for the very real and precious works of art of which she was despoiled on the occasion of his visit to her shores. At first sight, that visit looks like nothing better than a display of triumphant buffoonery on the one side and of servile adulation on the other. But, in reality, it was a turning-point in the history of civilisation, the awakening to new glories of a race in whom life had become, to all outward appearance, extinct. For more than a whole century the seat of intellectual supremacy had been established in Rome; and during the same period Rome herself had turned to the West rather than to the East for renovation and support. Caesars conquests were like the revelation of a new world; and three times over, when the two halves of the divided empire came into collision, the champion who commanded the resources of that world had won. Henceforth it was to her western provinces and to her western frontiers that Rome looked for danger, for aggrandisement, or for renown. In Horaces time, men asked each other what the warlike Cantabrians were planning; and the personal presence of Augustus himself was needed before those unruly Iberians could be subdued. His adopted sons earned their first laurels at the expense of Alpine mountaineers. His later years are filled with German campaigns; and the great disaster of Varus must have riveted attention more closely than any victory to what was passing between the Rhine and the Elbe. Under Claudius, the conquest of Britain opened a new source of interest in the West, and, like Germany before, supplied a new title of triumph to the imperial family. Half the literary talent in Rome, the two Senecas, Lucan, and at a269 later period Martial and Quintilian, came from Spain, as also did Trajan, whose youth fall in this period.

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FORE: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 [86] 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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FORE:7

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TWO:CHAPTER X
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THREE:"How you spoil that child," she said. "Hetty, take her away."
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THREE:"I am afraid so. It is no time for idle recrimination. The gambling fever was on me the other night and I felt that I must play. I tried to borrow money that evening, but not one of the wretches would trust me with a shilling. I had those notes upstairs; they formed my rescue in case of a collapse. It seemed to me that nobody would be any the wiser. I brought them down, and gambled with them. And beyond all doubt, Gilbert Lawrence has traced them to me."
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THREE:The amphibian! cried Larry. I wonder whyThus Hetty out of doors and in the sunshine. She and Bruce had a thousand plans to make, a score of shops to look into. Their tastes were the same, and principally lay in the direction of the old and antique.
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TWO:The first impressions an apprentice forms of the smith-shop as a department of an engineering establishment is that it is a black, sooty, dirty place, where a kind of rough unskilled labour is performeda department which does not demand much attention. How far this estimate is wrong will appear in after years, when experience has demonstrated the intricacies and difficulties of forging, and when he finds the skill in this department is more difficult to obtain, and costs more relatively than in any other. Forging as a branch of work requires, in fact, the highest skill, and is one where the operation continually depends upon the judgment of the workman, which neither power nor machines can to any extent supplant. Dirt, hard labour, and heat deter men from learning to forge, and create a preference for the finishing shop, which in most places makes a disproportion between the [102] number of smiths and finishers.Caloric or air engines.
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TWO:"I prefer to regard the lady for the present as Countess Lalage," said Lawrence. "But we can find a better place for discussion than this."
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TWO:All the wounded were Roman Catholics, and as they saw the approaching priest, they implored him in a loud voice to give them absolution of sins, some making an act of contrition. The priest was unable to come near each of them, and therefore called out in a loud voice: "My Jesus, be merciful!" He then gave them all absolution of sins. But as he kneeled down to perform this sacred task, a hostile bullet whizzed past his ear, and several soldiers who ran by aimed at him, so that he had to seek safety behind a tree. I saw with my own eyes five bullet-holes in the tree that was pointed out to me.It has been mentioned that Carneades was the head of the Academic school. In that capacity, he was the lineal inheritor of Platos teaching. Yet a public apology for injustice, even when balanced by a previous panegyric on its opposite, might seem to be of all lessons the most alien from Platonism; and in a State governed by Platos own laws, it would certainly have been punishable with death. To explain this anomaly is to relate the history of Greek scepticism, which is what we shall now attempt to do.
THREE:"There are five more which I have not read yet. I understand there are allusions to a certain Countess who, as Prout politely put it, shall be nameless. My boy, I feel quite certain that this will lead to--what's up?"
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The inconsistencies of a great philosophical system are best explained by examining its historical antecedents. We have already attempted to disentangle the roots from which Stoicism was nourished, but one of the most important has not yet been taken into account. This was the still continued influence of Parmenides, derived, if not from his original teaching, then from some one or more of the altered shapes through which it had passed. It has been shown how Zeno used the Heracleitean method to break down all the demarcations laboriously built up by Plato and Aristotle. Spirit was identified with matter; ideas with aerial currents; God with the world; rational with sensible evidence; volition with judgment; and emotion with thought. But the idea of a fundamental antithesis, expelled from every other department of enquiry, took hold with all the more energy on what, to Stoicism, was the most vital of all distinctionsthat between right and wrong.57 Once grasp this transformation of a metaphysical into a moral principle, and every paradox of the system will be seen to follow from it with logical necessity. What the supreme Idea had been to Plato and self-thinking thought to Aristotle, that virtue became to the new school, simple, unchangeable, and self-sufficient. It must not only be independent of pleasure and pain, but absolutely 26incommensurable with them; therefore there can be no happiness except what it gives. As an indivisible unity, it must be possessed entirely or not at all; and being eternal, once possessed it can never be lost. Further, since the same action may be either right or wrong, according to the motive of its performance, virtue is nothing external, but a subjective disposition, a state of the will and the affections; or, if these are to be considered as judgments, a state of the reason. Finally, since the universe is organised reason, virtue must be natural, and especially consonant to the nature of man as a rational animal; while, at the same time, its existence in absolute purity being inconsistent with experience, it must remain an unattainable ideal.If it were not for securing vent for gas, moulds could be made from plastic material so as to produce fine castings with clear sharp outlines.It is not proposed at this time to treat of the construction of machinery for transmitting power, but to examine into the conditions that should determine which of the several plans of transmitting is best in certain caseswhether belts, gearing, or shafts should be employed, and to note the principles upon which they operate. Existing examples do not furnish data as to the advantages of the different plans for transmitting power, because a given duty may be successfully performed by belts, gearing, or shaftseven by water, air, or steamand the comparative advantages of different means of transmission is not always an easy matter to determine.There is no use in entering upon detailed explanations of what a learner has before him. Shafts are seen wherever there is machinery; it is easy to see the extent to which they are employed to transmit power, and the usual manner of arranging them. Various text-books afford data for determining the amount of torsional strain that shafts of a given diameter will bear; explain that their capacity to resist torsional strain is as the cube of the diameter, and that the deflection from transverse strains is so many degrees; with many other matters that are highly useful and proper to know. I will therefore not devote any space to these things here, but notice some of the more obscure conditions that pertain to shafts, such as are demonstrated by practical experience rather than deduced from mathematical data. What is said will apply especially to what is called line-shafting for conveying and distributing power in machine-shops and other manufacturing establishments. The following propositions in reference to shafts will assist in understanding what is to follow:Borrowing Dicks jackknife for a weight, Sandy prepared the message."Perhaps you knew also the culprit," the Countess suggested.
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