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TWO:(1.) Why are machine frames constructed in sections, instead of being in one piece?��(2.) Why must parts which have contact on opposite sides have specific dimensions?��(3.) What are standards of measure based upon in England, America, and France?��(4.) How can weight be measured by time?��(5.) Has the French metre proved a standard admitting of test reference?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 More info

TWO:We have already seen how this fundamental division is applied to the universe as a whole. But our philosopher is not content with classifying the phenomena as he finds360 them; he attempts to demonstrate the necessity of their dual existence; and in so doing is guilty of something very like a vicious circle. For, after proving from the terrestrial movements that there must be an eternal movement to keep them going, he now assumes the revolving aether, and argues that there must be a motionless solid centre for it to revolve round, although a geometrical axis would have served the purpose equally well. By a still more palpable fallacy, he proceeds to show that a body whose tendency is towards the centre, must, in the nature of things, be opposed by another body whose tendency is towards the circumference. In order to fill up the interval created by this opposition, two intermediate bodies are required, and thus we get the four elements��earth, water, air, and fire. These, again, are resolved into the antithetical couples, dry and wet, hot and cold, the possible combinations of which, by twos, give us the four elements once more. Earth is dry and cold, water cold and wet, air wet and hot, fire hot and dry; each adjacent pair having a quality in common, and each element being characterized by the excess of a particular quality; earth is especially dry, water cold, air wet, and fire hot. The common centre of each antithesis is what Aristotle calls the First Matter, the mere abstract unformed possibility of existence. This matter always combines two qualities, and has the power of oscillating from one quality to another, but it cannot, as a rule, simultaneously exchange both for their opposites. Earth may pass into water, exchanging dry for wet, but not so readily into air, which would necessitate a double exchange at the same moment. More info