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    Software name: appdown
    Software type: Microsoft Framwork

    size: 303MB

    Lanuage:Englist

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      The range and speed of movement of the parts of machines are elements in designing that admit of a definite determination from the work to be accomplished, but arrangement cannot be so determined, and is the most difficult to find data for. To sum [154] up these propositions we have:


      Good! panted Dick, unaware that his voice carried through the tube to Larry, who nodded.


      During the meeting of the British Association in Belfast (1874), the committee appointed to investigate the means of teaching Physical Science, reported that "the most serious obstacle discovered was an absence from the minds of the pupils of a firm and clear grasp of the concrete facts forming a base of the reasoning processes they are called upon to study; and that the use of text-books should be made subordinate to an attendance upon lectures and demonstrations."

      Close to the grassy, channel-divided marsh, flying in a sort of spiral to cover every bit of ground, the amphibian was moving.

      The good man's face became quite cheerful, he grasped my hand, deeply moved, and, pressing it warmly, said:An apprentice may get a clear idea of this venting process by inspecting tubular core barrels, such as are employed in moulding pipes or hollow columns, or by examining ordinary cores about a foundry. Provision of some kind to 'carry off the vent,' as it is termed by moulders, will be found in every case. The venting of moulds is even more important than venting cores, because core vents only carry off gas generated within the core itself, while the gas from its exterior surface, and from the whole mould, has to find means of escaping rapidly from the flasks when the hot metal enters.


      A pendulum vibrating in uniform time regardless of distance, but always as its length, if arranged to perform one vibration in a given time, gave a constant measure of length. Thus lineal measure comes from time; cubic or solid measures from lineal measure, and standards of weight from the same source; because when a certain quantity of a substance of any kind could be determined by lineal measurement, and this quantity was weighed, a standard of weight would be reached, provided there was some substance sufficiently uniform, to which reference could be made in different countries. Such a substance is sea or pure water; weighed in vacuo, or with the air at an assumed density, water gives a result constant enough for a standard of [147] weight.

      "The first day the religious were allowed to give them some food, although not sufficient. Soon they had nothing to eat but carrots and unripe fruit.

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      Bacon begins by demanding that throughout the whole range of experience new facts should be collected on the largest scale, in order to supply materials for scientific generalisation. There can be no doubt that he is here guided by the example of Aristotle, and of Aristotle alone. Such a storehouse of materials is still extant in the History of Animals, which evidently suggested the use of the word History in this sense to Bacon, and which, by the way, is immensely superior to anything that he ever attempted in374 the same line. The facts on which Aristotles Politics is based were contained in another vast descriptive work of the same kind, now unhappily lost. Even the Stagirites more systematic treatises comprise a multitude of observations, catalogued according to a certain order, but not reduced to scientific principles. What Bacon did was to carry out, or to bid others carry out, the plan so suggested in every department of enquiry. But if we ask by what method he was guided in his survey of the whole field to be explored, how he came by a complete enumeration of the sciences, arranged according to their logical order,the answer is still that he borrowed it from the Peripatetic encyclopaedia.

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      CHAPTER XXVII SANDYS DISCOVERY


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