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    Software name: appdown
    Software type: Microsoft Framwork

    size: 884MB

    Lanuage:Englist

    Software instructions


      (1.) What kind of strains are shafts subjected to?(2.) What determines the strength of shafts in resisting transverse strain?(3.) Why are shafts often more convenient than belts for transmitting power?(4.) What is the difference between the strains to which shafts and belts are subjected?(5.) What is gained by constructing a line shaft of sections diminishing in size from the first mover?(6.) What is gained by constructing line shafts of uniform diameter?


      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.

      "Have the Germans done no harm here yet?"Imet the estate caretaker in the village. He asked me to run on ahead and tell youand Mr. Whiteside Sandy watched, he could not find a Six-B slotted bolt anywhere!


      So far, virtue was with the Greeks what it must inevitably be with all men at first, chiefly self-regarding, a refined form of prudence. Moreover, other-regarding virtues gave less scope for reflection, being originally comprehended under obedience to the law. But there were two circumstances which could not long escape their notice; first, that fraud and violence are often, at least apparently, profitable to those who perpetrate them, a fact bitterly remarked by Hesiod;50 and secondly, that society cannot hold together without justice. It was long before Governments grew up willing and able to protect their subjects from mutual aggressions, nor does positive law create morality, but implies it, and could not be worked without it. Nor could international obligations be enforced by a superior tribunal; hence they have remained down to the present day a fertile theme for ethical discussion. It is at this point that morality forms a junction with religion, the history of which is highly interesting, but which can here be64 only briefly traced. The Olympian divinities, as placed before us by Homer, are anything but moral. Their conduct towards each other is that of a dissolute nobility; towards men it is that of unscrupulous partisans and patrons. A loyal adherence to friends and gratitude for sacrificial offerings are their most respectable characteristics, raising them already a little above the nature-powers whence they were derived. Now, mark how they first become moralised. It is by being made witnesses to an oath. Any one who is called in to testify to a promise feels aggrieved if it is broken, looking on the breach as an insult to his own dignity. As the Third Commandment well puts it, his name has been taken in vain. Thus it happened that the same gods who left every other crime unpunished, visited perjury with severe and speedy retribution, continued even after the offenders death.51 Respect for a contract is the primary form of moral obligation, and still seems to possess a peculiar hold over uneducated minds. We see every day how many persons will abstain from actions which they know to be immoral because they have given their word to that effect, not because the actions themselves are wrong. And for that reason law courts would be more willing to enforce contracts than to redress injuries. If, then, one person inflicted damage on another, he might afterwards, in order to escape retaliation from the injured party, or from his family, engage to give satisfaction, and the court would compel him to redeem his promise.52 Thus contract, by procuring redress for every species of wrong, would gradually extend its own obligatory character to abstinence from injury in general, and the divine sanctions primarily invoked on behalf of oaths would be extended, with them, over the whole domain of moral conduct.Yeah, grinned Jeff. Thanks to Sandy for leaving the book there, and thanks toa certain relative of yours for leaving a marker at the right place. Now, take a look at these pictures out of your family album. They are pictures of the man who originally got the emeralds in India, and his son. Whose face that you know is close to being the same?

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      Silhouetted against the northern blue of the sky, with a tiny white circle showing sharply in the sunlight, the leaping person fell clear of the diving seaplane, while Larry, shaking with excitement, tried to focus his glasses and train them on the falling object.A second point to be noticed in hammers of this class is the nature of the connection with the driving power. In all cases there will be found an equivalent for the elastic helve of the trip-hammereither air cylinders, deflecting springs, or other yielding attachments,interposed between the crank and the hammer-head, also a slipping frictional belt or frictional clutches for driving, as in the case of trip-hammers.

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      Dick, clinging with all his strength to a wiry, supple powerful body, strove to keep that hold while he captured the hands that were pounding at his neck and averted face.It will have been observed that, so far, the merit of originating atomism has been attributed to Leucippus, instead of to the more celebrated Democritus, with whose name it is usually associated. The two were fast friends, and seem always to have worked together in perfect harmony. But Leucippus, although next to nothing is known of his life, was apparently the older man, and from him, so far as we can make out, emanated the great idea, which his brilliant coadjutor carried into every department of enquiry, and set forth in works which are a loss to literature as well as to science, for the poetic splendour of their style was not less remarkable than the encyclopaedic range of their contents. Democritus was born at Abdra, a Thracian city, 470 B.C., a year before Socrates, and lived to a very advanced agemore than a hundred, according to some accounts. However this may be, he was probably, like most of his great countrymen, possessed of immense vitality. His early manhood was spent in Eastern travel, and he was not a little proud of the numerous countries which he had visited, and the learned men with whom he had conversed. His time was mostly occupied in observing Nature, and in studying mathematics; the sages of Asia and Egypt may have acquainted him with many useful scientific facts, but we have seen that his philosophy was derived from purely Hellenic sources. A few fragments of his numerous writings still survivethe relics of an intellectual Ozymandias. In them are briefly shadowed forth the conceptions which Lucretius, or at least his modern36 English interpreters, have made familiar to all educated men and women. Everything is the result of mechanical causation. Infinite worlds are formed by the collision of infinite atoms falling for ever downward through infinite space. No place is left for supernatural agency; nor are the unaided operations of Nature disguised under Olympian appellations. Democritus goes even further than Epicurus in his rejection of the popular mythology. His system provides no interstellar refuge for abdicated gods. He attributed a kind of objective existence to the apparitions seen in sleep, and even a considerable influence for good or for evil, but denied that they were immortal. The old belief in a Divine Power had arisen from their activity and from meteorological phenomena of an alarming kind, but was destitute of any stronger foundation. For his own part, he looked on the fiery spherical atoms as a universal reason or soul of the world, without, however, assigning to them the distinct and commanding position occupied by a somewhat analogous principle in the system which we now proceed to examine, and with which our survey of early Greek thought will most fitly terminate.

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      The EndWith these conclusions in his mind, but little progress will be made, and hence the reason for introducing the subject here.


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