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FORE: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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FORE:Lalage thrust out his arm and grasped a silken shoulder.
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FORE:"Of course I was. Leon and myself had come to an understanding. He was going abroad after he had sent you the money. At great risk to myself I passed between here and the Corner House. I had to disguise myself. And when everything was ready Leon got at the brandy bottle again. For some nights he had not slept. When I got to the Corner House late that night Leon was practically dead. Ah, better for me if I had left him to die."German officials told that immediately after the surrender Maubeuge had been set on fire in various places, because civilians, etc.... The reader is by now able to complete the sentence.
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FORE:Considered upon grounds of commercial expediency as a question of cost alone, it is generally cheaper to move material by hand when it can be easily lifted or moved by workmen, when the movement is mainly in a horizontal direction, and when the labour can be constantly employed; or, to assume a general rule which in practice amounts to much the same thing, vertical lifting should be done by motive power, and horizontal movement for short distances performed by hand. There is nothing more unnatural than for men to carry loads up stairs or ladders; the effort expended in such cases is one-half or more devoted to raising the weight of the body, which is not utilised in the descent, and it is always better to employ winding or other mechanism for raising weights, even when it is to be operated by manual labour. Speaking of this matter of carrying loads upward, I am reminded of the fact that builders in England and America, especially in the latter country, often have material carried up ladders, while in some of the older European countries, where there is but little pretension to scientific manipulation, bricks are usually tossed from one man to another standing on ladders at a distance of ten to fifteen feet apart.
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FORE: CHAPTER I"You and I are going there secretly?" he asked. "Do you mean now?"
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FORE:Euripides is not a true thinker, and for that very reason fitly typifies a period when religion had been shaken to its very foundation, but still retained a strong hold on mens minds, and might at any time reassert its ancient authority with unexpected vigour. We gather, also, from his writings, that ethical sentiment had undergone a parallel transformation. He introduces characters and actions which the elder dramatists would have rejected as unworthy of tragedy, and not only introduces them, but composes elaborate speeches in their defence. Side by side with examples of devoted heroism we find such observations as that everyone loves himself best, and that those are most prosperous who attend most exclusively to their own interests. It so happens that in one instance where Euripides has chosen a subject already handled by Aeschylus, the difference of treatment shows how great a moral revolution had occurred in the interim. The conflict waged between Eteocls and Polyneics for their fathers throne is the theme both of the Seven against Thebes and of the Phoenician Women. In both, Polyneics bases his claim on grounds of right. It had been agreed that he and his brother should alternately hold sway over Thebes. His turn has arrived, and Eteocls refuses to give way. Polyneics endeavours to enforce his pretensions by bringing a foreign army against Thebes. Aeschylus makes him appear before the walls with an allegorical figure of Justice on his shield, promising to restore him to his fathers seat. On hearing this, Eteocls exclaims:
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