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Most of the difficulties which formerly pertained to drilling are now removed by machine-made drills which are manufactured and sold as an article of trade. Such drills do not require dressing and tempering or fitting to size after they are in use, make true holes, are more rigid than common solid shank drills, and will drill to a considerable depth without clogging.

ONE:I think proper to point out these peculiarities, not so much from any importance they may have in themselves, but to suggest critical investigation, and to dissipate any preconceived opinions of forging being a simple matter, easy to learn, and involving only commonplace operations.

ONE:In planing and turning, the tools require no exact form; they can be roughly made, except the edge, and even this, in most cases, is shaped by the eye. Such tools are maintained at a trifling expense, and the destruction of an edge is a matter of no consequence. The form, temper, and strength can be continually adapted to the varying conditions of the work and the hardness of material. The line of division between planing and milling is fixed by two circumstances��the hardness and uniformity of the material to be cut, and the importance of duplication. Brass, clean iron, soft steel, or any homogeneous metal not hard enough to cause risk to the tools, can be milled at less expense than planed, provided there is enough work of a uniform character to justify the expense of milling tools. Cutting the teeth of wheels is an example where milling is profitable, but not to the extent generally supposed. In the manufacture of small arms, sewing machines, clocks, and especially watches, where there is a constant and exact duplication of parts, milling is indispensable. Such manufactures are in some cases founded on milling operations, as will be pointed out in another chapter.

ONE:Let it be remembered that the gods of whom Plato is speaking are the sun, moon, and stars; that the atheists whom he denounces only taught what we have long known to be true, which is that those luminaries are no more divine, no more animated, no more capable of accepting our sacrifices or responding to our cries than is the earth on which we tread; and that he attempts to prove the contrary by arguments which, even if they were not inconsistent with all that we know about mechanics, would still be utterly inadequate to the purpose for which they are employed.

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TWO:His expression altered to a puzzled scowl.

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THREE:In steadily increasing force, and gradually coming oftener, the puffs of moving air increased their confidence."A question that can never be solved," the Countess gasped.

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THREE:There is, perhaps, no passage in Aristotle��s writings��there is certainly none in his scientific writings��more eloquent than that which describes the glory of his imaginary heavens. The following translation may give some faint idea of its solemnity and splendour:��

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THREE:

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THREE:This article has been introduced, not only to give a true understanding of the effect and value of machine combination, but to caution against a common error of confounding machine combination with invention.

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THREE:Leona bent forward to listen. Even Charlton seemed to have forgotten his troubles for the moment. A beam of light illuminated his sombre face.Then, pushing off in the rubber boat, he sat still, his dry clothes in a compact bundle in the boat thwarts, while Jeff let the wind and tide-run carry his amphibian out of the channel to where he could get sea space for a start, to get the amphibian pontoons ��on the step�� from which, with his silent cargo of human tragedy, Jeff lifted into air and went out of sight, southbound.

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THREE:"That fiend probably told some accomplice," he said.

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TWO:

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THREE:��Guess I��ll have to trace my gas line and ignition to see if a break made this trouble.�� Jeff began removing his leather coat. ��Say! By golly! Do you know where I think we��ve set down?��

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THREE:VI.Pattern-making relates to the construction of duplicate models for the moulded parts of machinery, and involves a knowledge of shrinkage and cooling strains, the manner of moulding and proper position of pieces, when cast, to ensure soundness in particular parts. As a branch of machine manufacture, pattern-making requires a large amount of special knowledge, and a high degree of skill; for in no other department is there so much that must be left to the discretion and judgment of workmen.

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THREE:127Ghastly reminders of their former feasts.192

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TWO:An apprentice may learn that power is not increased or diminished by being transmitted through a train of wheels which change both speed and force, and he may believe the proposition without having a "conviction" of its truth. He must first learn to regard power as a constant and indestructible element��something that may be weighed, measured, and transmitted, but not created or destroyed by mechanism; then the nature of the mechanism may be understood, but not before.

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"You left that lady behind you?" he said. "Who is to testify to that? If you can prove such to be the case, why----""Well? Go on, nothing could be worse than what has happened."6. The diminished cost of generating power on a large scale, compared with a number of separate steam engines distributed over manufacturing districts.It was quiet enough in Churton Street. And again in Collin's Crescent, which was so near home that the long line of Lytton Avenue could be seen. But there again standing figures came out of the gloom and the car sped on.

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