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FORE:Judged upon theoretical grounds, and leaving out the mechanical conditions of operation, it would at once be conceded that a proper plan would be to move the lightest body; that is, if the tools and their attachments were heavier than the material to be acted upon, then the material should be moved for the cutting action, and vice versa. But in practice there are other conditions to be considered more important than a question of the relative weight of reciprocating parts; and it must be remembered that in solving any problem pertaining to machine action, the conditions of operation are to be considered first and have precedence over problems of strain, arrangement, or even the general principles of construction; that is, the conditions of operating must form a base from which proportions, arrangements, and so on, must be deduced. A standard planing machine, such as is employed for most kinds of work, is arranged with a running platen or carriage upon which the material is fastened and traversed beneath the cutting tools. [130] The uniformity of arrangement and design in machines of this kind in all countries wherever they are made, must lead to the conclusion that there are substantial reasons for employing running platens instead of giving a cutting movement to the tools.CHAPTER XXXII. SLOTTING MACHINES.

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FORE:This brings us back to the old proposition, that for structures which do not involve motion, mathematical data will furnish dimensions; but the same rule will not apply in machinery. To follow the proportions for shafts that would be furnished by pure mathematical data would in nearly all cases lead to error. Experience has demonstrated that for ordinary cases, where power is transmitted and applied with tolerable regularity, a shaft three inches in diameter, making one hundred and fifty revolutions a minute, its bearings three to four diameters in length, and placed ten feet apart, will safely transmit fifty horse-power.

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FORE:CHAPTER LIV. A STAB IN THE DARK.

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FORE:Jeff explained. He had sent a radiogram to the yacht, and as its owner had already sent one identifying Jeff, he was given the information that the real necklace was being brought back, extra heavily insured in a London company, by the captain himself.Hetty sat there all alone for some time wondering. It looked as if fate was playing into her hands. If the man lying at the point of death could only speak, if he could only be induced to do so.

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FORE:No sooner did the two imperial systems lose their ascendency than the germs which they had temporarily overshadowed sprang up into vigorous vitality, and for more than4 five centuries dominated the whole course not only of Greek but of European thought. Of these by far the most important was the naturalistic idea, the belief that physical science might be substituted for religious superstitions and local conventions as an impregnable basis of conduct. In a former chapter1 we endeavoured to show that, while there are traces of this idea in the philosophy of Heracleitus, and while its roots stretch far back into the literature and popular faith of Greece, it was formulated for the first time by the two great Sophists, Prodicus and Hippias, who, in the momentous division between Nature and Law, placed themselves��Hippias more particularly��on the side of Nature. Two causes led to the temporary discredit of their teaching. One was the perversion by which natural right became the watchword of those who, like Plato��s Callicles, held that nothing should stand between the strong man and the gratification of his desire for pleasure or for power. The other was the keen criticism of the Humanists, the friends of social convention, who held with Protagoras that Nature was unknowable, or with Gorgias that she did not exist, or with Socrates that her laws were the secret of the gods. It was in particular the overwhelming personal influence of Socrates which triumphed. He drew away from the Sophists their strongest disciple, Antisthenes, and convinced him that philosophy was valuable only in so far as it became a life-renovating power, and that, viewed in this light, it had no relation to anything outside ourselves. But just as Socrates had discarded the physical speculations of former teachers, so also did Antisthenes discard the dialectic which Socrates had substituted for them, even to the extent of denying that definition was possible.2 Yet he seems to have kept a firm hold on the two great ideas that were the net result of all previous philosophy, the idea of a cosmos, the common citizenship of which made all men5 potentially equal,3 and the idea of reason as the essential prerogative of man.4A lot of artillery and a great number of soldiers were in the market-place ready to start. The commander sent one of his officers to us, who addressed me, examined my papers, and then said that I had surely met Belgian soldiers on the way. Of course I denied this emphatically.

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FORE:

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FORE:Very many other cases of martyrdom among priests remained unknown to me, but the various Belgian bishops examined all these events with praiseworthy zeal and scrupulousness, and by taking extensive evidence established the fact that in no case the victims could be reproached with any act that justified the sentence against them. After the war the world will surely be made acquainted with the horrible truth.Reciprocating tools are divided into those wherein the cutting movement is given to the tools, as in shaping and slotting machines, and machines wherein the cutting movement is given to the material to be planed, as in a common planing machine. Very strangely we find in general practice that machine tools for both the heaviest and the lightest class of work, such as shaping, and butting, operate upon the first principle, while pieces of a medium size are generally planed by being moved in contact with stationary tools.

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FORE:��This can��t last long, for us,�� thought Larry. ��We��ll be down to the water before we know it!��

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