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If the cessation of speculative activity among the Greeks needs to be accounted for by something more definite than phrases about the objective and the subjective, so also does its resumption among the nations of modern Europe. This may be explained by two different circumstancesthe disapxvipearance of the obstacles which had long opposed themselves to the free exercise of reason, and the stimulus given to enquiry by the Copernican astronomy. After spreading over the whole basin of the Mediterranean, Hellenic culture had next to repair the ravages of the barbarians, and, chiefly under the form of Christianity, to make itself accepted by the new nationalities which had risen on the ruins of the Roman empire. So arduous a task was sufficient to engross, during many centuries, the entire intellectual energies of Western Europe. At last the extreme limits of diffusion were provisionally reached, and thought once more became available for the discovery of new truth. Simultaneously with this consummation, the great supernaturalist reaction, having also reached its extreme limits, had so far subsided, that Nature could once more be studied on scientific principles, with less freedom, indeed, than in old Ionia, but still with tolerable security against the vengeance of interested or fanatical opponents. And at the very same conjuncture it was shown by the accumulated observations of many ages that the conception of the universe on which the accepted philosophy rested must be replaced by one of a directly opposite description. I must confess that in this vast revolution the relation between the objective and the subjective, as reconstituted by Christianity and the Germanic genius, does not seem to me to have played a very prominent part.

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"That is a good omen," she said. "They will be all after you now, dear."Owing to this difference in the manner of guiding and supporting the cutting edges, and the advantages of an axial support for tools in boring, it becomes an operation by which the most accurate dimensions are attainable, while drilling is a comparatively imperfect operation; yet the ordinary conditions of machine fitting are such that nearly all small holes can be drilled with sufficient accuracy.As a means for transmitting power, shafts afford the very important advantage that power can be easily taken off at any point throughout their length, by means of pulleys or gearing, also in forming a positive connection between the motive-power and machines, or between the different parts of machines. The capacity of shafts in resisting torsional strain is as [46] the cube of their diameter, and the amount of torsional deflection in shafts is as their length. The torsional capacity being based upon the diameter, often leads to the construction of what may be termed diminishing shafts, lines in which the diameter of the several sections are diminished as the distance from the driving power increases, and as the duty to be performed becomes less. This plan of arranging line shafting has been and is yet quite common, but certainly was never arrived at by careful observation. Almost every plan of construction has both advantages and disadvantages, and the best means of determining the excess of either, in any case, is to first arrive at all the conditions as near as possible, then form a "trial balance," putting the advantages on one side and the disadvantages on the other, and footing up the sums for comparison. Dealing with this matter of shafts of uniform diameter and shafts of varying diameter in this way, there may be found in favour of the latter plan a little saving of material and a slight reduction of friction as advantages. The saving of material relates only to first cost, because the expense of fitting is greater in constructing shafts when the diameters of the different pieces vary; the friction, considering that the same velocity throughout must be assumed, is scarcely worth estimating. このページの先頭です
ONE:"You remember the case of my wife?" Charlton asked suddenly. "Ah, I see you do. Well, I am going to tell you my story. You are a man of sentiment and feeling, or your novels greatly belie you. And a doctor always respects confidence. When my wife died there was an inquiry extending over many days. The great question was: Had she poisoned herself, did she take poison by misadventure, or did I kill her? Nine people out of every ten believed I was guilty. I let them believe it at the risk of my neck, and why?"
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ONE:"Which will be a powerful weapon in her hands."
TWO:"At about nine o'clock the soldiers drove all who had been found in the houses in front of them by means of blows from their rifle-butts. They crowded them together in the Place d'Armes, where they kept them until six o'clock in the evening. Their guards amused themselves by telling the men repeatedly that they would soon be shot.CHAPTER V MYSTERY IN THE FOG
THREE:Without any wish to discourage the ambition of an apprentice to invent, which always inspires him to laudable exertion, it is nevertheless best to caution him against innovations. The estimate formed of our abilities is very apt to be inversely as our experience, and old engineers are not nearly so confident in their deductions and plans as beginners are.
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THREE:"I am as poor as yourself," Balmayne contrived to say.