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THREE:But already Balmayne was prepared for that. His luminous cunning brain saw the whole way clear. To save the situation a great sacrifice would have to be made. A coup de thatre was necessary.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.
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THREE:It will be remembered that in an earlier section of this chapter we accompanied Plato to a period when he had provisionally adopted a theory in which the Protagorean contention that virtue can be taught was confirmed and explained by the Socratic contention that virtue is knowledge; while this knowledge again was interpreted in the sense of a hedonistic calculus, a prevision and comparison of the pleasures and pains consequent on our actions. We have now to trace the lines of thought by which he was guided to a different conception of ethical science.The foregoing analysis will enable us to appreciate the true significance of the resemblance pointed out by Zeller153259 between the Platonic republic and the organisation of mediaeval society. The importance given to religious and moral training; the predominance of the priesthood; the sharp distinction drawn between the military caste and the industrial population; the exclusion of the latter from political power; the partial abolition of marriage and property; and, it might be added, the high position enjoyed by women as regents, chatelaines, abbesses, and sometimes even as warriors or professors,are all innovations more in the spirit of Plato than in the spirit of Pericles. Three converging influences united to bring about this extraordinary verification of a philosophical deal. The profound spiritual revolution effected by Greek thought was taken up and continued by Catholicism, and unconsciously guided to the same practical conclusions the teaching which it had in great part originally inspired. Social differentiation went on at the same time, and led to the political consequences logically deduced from it by Plato. And the barbarian conquest of Rome brought in its train some of those more primitive habits on which his breach with civilisation had equally thrown him back. Thus the coincidence between Platos Republic and mediaeval polity is due in one direction to causal agency, in another to speculative insight, and in a third to parallelism of effects, independent of each other but arising out of analogous conditions.
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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus sagittis egestas mauris ut vehicula. Cras viverra ac orci ac aliquam. Nulla eget condimentum mauris, eget tincidunt est.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus sagittis egestas mauris ut vehicula. Cras viverra ac orci ac aliquam. Nulla eget condimentum mauris, eget tincidunt est.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus sagittis egestas mauris ut vehicula. Cras viverra ac orci ac aliquam. Nulla eget condimentum mauris, eget tincidunt est.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus sagittis egestas mauris ut vehicula. Cras viverra ac orci ac aliquam. Nulla eget condimentum mauris, eget tincidunt est.