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Another principle in planing machines which deserves notice is the manner of driving carriages or platens; this is usually performed by means of spur wheels and a rack. A rack movement is smooth enough, and effective enough so far as a mechanical connection between the driving gearing and a platen, but there is a difficulty met with from the torsion and elasticity of cross-shafts and a train of reducing gearing. In all other machines for metal cutting, it has been a studied object to have the supports for both the tools and the material as rigid as possible; but in the common type of planing machines, such as have rack and pinion movement, there is a controversion of this principle, inasmuch as a train of wheels and several cross-shafts constitute a very effective spring between the driving power and the point of cutting, a matter that is easily proved by planing across the teeth of a rack, or the threads of a screw, on a machine arranged with spur wheels and the ordinary reducing gearing. It is true the inertia of a platen is interposed and in a measure overcomes this elasticity, but in no degree that amounts to a remedy.

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Side by side, however, with these exalted aspirations, the old popular belief in a subterranean abode of souls survived under its very crudest forms; and here also modern explorations have brought to light very surprising evidence of the strength with which the grotesque idea of Charon the Stygian ferryman still kept its hold on the imagination of uneducated people. Originally peculiar to Greece, where it still exists under a slightly altered form, this superstition penetrated into the West at a comparatively early period. Thus in the tombs of Campania alone many hundred skeletons have been found with bronze coins in their mouths, placed there to pay their passage across the Styx; and explorations at Praeneste show that this custom reaches back to the middle of the237 fourth century B.C. We also learn from Lucian that, in his time, the old animistic beliefs were entertained to the extent of burning or burying the clothes, ornaments, and other appurtenances of deceased persons along with their bodies, under the idea that the owners required them for use in the other world; and it is to such deposits that our museums of classical antiquity owe the greater part of their contents.369

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FORE: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."What, the diamonds that have caused all this trouble to get. Never!" 100 GB
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THREE:The contents of the present work, except the Introduction and the chapter on Gauges, consist mainly in a revision of a series of articles published in "Engineering" and the Journal of the Franklin Institute, under the head of "The Principles of Shop Manipulation," during 1873 and 1874.Or Justice most unjustly were she called

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THREE:II."If I confess," Leona suggested--"if I confess, will you promise----."

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TWO:Ren shook his head. He could hear nothing at all. He said so impatiently. It seemed to him that his companion was playing with him.

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The combination of several functions in one machine, although it may not seem an important matter to be considered here, is nevertheless one that has much to do with the manufacture of machines, and constitutes what may be termed a principle of construction."It has gone from my mind," he said. "It is so long ago. Even then my brother and this woman had drifted apart. I am not happy in my mind today, for your news has disturbed me more than I can tell. Even a rascal like myself can be possessed of a heart, eh?"His face slowly changed, gradually became red.
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