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Plato had, in truth, a conception of science which no knowledge then attainedperhaps one may add, no knowledge ever attainablecould completely satisfy. Even the rigour of mathematical demonstration did not content him, for mathematical truth itself rested on unproved assumptions, as we also, by the way, have lately discovered. Perhaps the Hegelian system would have fulfilled his requirements; perhaps not even that. Moreover, that the new order which he contemplated might be established, it was necessary to begin by making a clean sweep of all existing opinions. With the urbanity of an Athenian, the piety of a disciple, and the instinct of a great dramatic artist, he preferred to assume that this indispensable task had already been done by another. And of all preceding thinkers, who was so well qualified for the undertaking as Socrates? Who else had wielded the weapons of negative dialectic with such consummate dexterity? Who had assumed such a critical attitude towards the beliefs of his contemporaries? Who had been so anxious to find a point of attachment for every new truth in the minds of his interlocutors? Who therefore could, with such116 plausibility, be put forward in the guise of one who laid claim to no wisdom on his own account? The son of Phaenaret seemed made to be the Baptist of a Greek Messiah; but Plato, in treating him as such, has drawn a discreet veil over the whole positive side of his predecessors teaching, and to discover what this was we must place ourselves under the guidance of Xenophons more faithful report.CHAPTER III. THE PLACE OF SOCRATES IN GREEK PHILOSOPHY. このページの先頭です
ONE:It may also be mentioned that lathes constructed with angular guides, have usually such ways for the moving heads as well as for the carriages; this gives the advantage of firmly binding the [125] two sides of the frame together in fastening the moving head, which in effect becomes a strong girt across the frame; the carriages also have an equal and independent hold on both sides of a shear. In following this matter thus far, it may be seen how many conditions may have to be considered in reasoning about so apparently simple a matter as the form of ways for lathe carriages; we might even go on to many more points that have not been mentioned; but what has been explained will serve to show that the matter is not one of opinion alone, and that without practical advantages, machine tool-makers will not follow the most expensive of these two modes of mounting lathe carriages.1. Never seen anything of a franc-tireur-guerilla.
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ONE:"You are not to say another word," Hetty said sternly."Very well," she said, "I'll come up for a moment. I'm not going far, and I shall not be a long time away. If there is a crisis in the case----"
TWO:The tools employed for cutting screw threads constitute a separate class among the implements of a fitting shop, and it is considered best to notice them separately.
THREE:The only purpose of my publication was to convince everybody of this, and thereby prevent the repetition of such a scandalous scene.
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THREE:The sudden and varied resistance to line shafts tends to loosen couplings, destroy gearing, and produce sudden strains that are unknown in other cases; and shafting arranged with the usual proportions for transmitting power will soon fail if applied to driving trip-hammers. Rigid connections or metal attachments ace impracticable, and a slipping belt arranged so as to have the tension varied at will is the usual and almost the only successful means of transmitting power to hammers. The motion of trip-hammers is a curious problem; a head and die weighing, together with the irons for attaching them, one hundred pounds, will, with a helve eight feet long, strike from two to three hundred blows a minute. This speed exceeds anything that could be attained by a direct reciprocal motion given to the hammer-head by a crank, and far exceeds any rate of speed that would be assumed from theoretical inference. The hammer-helve being of wood, is elastic, and acts like a vibrating spring, its vibrations keeping in unison with the speed of the tripping points. The whole machine, in fact, must be constructed upon a principle of elasticity throughout, and in this regard stands as an exception to almost every other known machine. The framing for supporting the trunnions, which one without experience would suppose should be very rigid and solid, is found to answer best when composed of timber, and still better when this timber is laid up in a manner that allows the structure to spring and [107] yield. Starting at the dies, and following back through the details of a trip-hammer to the driving power, the apprentice may note how many parts contribute to this principle of elasticity: Firstthe wooden helve, both in front of and behind the trunnion; nextthe trunnion bar, which is usually a flat section mounted on pivot points; thirdthe elasticity of the framing called the 'husk,' and finally the frictional belt. This will convey an idea of the elasticity required in connecting the hammer-head with the driving power, a matter to be borne in mind, as it will be again referred to.