ONE:A learner will no doubt wonder why sand is used for moulding, instead of some more adhesive material like clay. If he is not too fastidious for the experiment, and will apply a lump of damp moulding sand to his mouth and blow his breath through the mass, the query will be solved. If it were not for the porous nature of sand-moulds they would be blown to pieces as soon as the hot metal entered them; not only because of the mechanical expansion of the gas, but often from explosion by combustion. Gas jets from moulds, as may be seen at any time when castings are poured, will take fire and burn the same as illuminating gas.This code Plato set himself to construct in his last and longest work, the Laws. Less than half of that Dialogue, however, is occupied with the details of legislation. The remaining portions deal with the familiar topics of morality, religion, science, and education. The first book propounds a very curious theory of asceticism, which has not, we believe, been taken up by any subsequent moralist. On the principle of in vino veritas Plato proposes that drunkenness should be systematically employed for the purpose of testing self-control. True temperance is not abstinence, but the power of resisting temptation; and we can best discover to what extent any man possesses that power by surprising him when off his guard. If he should be proof against seductive influences even when in his cups, we shall be doubly sure of his constancy at other times. Prof. Jowett rather maliciously suggests that a personal proclivity may have suggested this extraordinary apology for hard drinking. Were it so, we should be reminded of the successive revelations by which indulgences of another kind were permitted to Mohammed, and of the one case in which divorce was sanctioned by Auguste Comte. We should also remember that the Christian Puritanism to which Plato approached so near has always been singularly lenient to this disgraceful vice. But perhaps a somewhat higher order of considerations will help us to a better under270standing of the paradox. Plato was averse from rejecting any tendency of his age that could possibly be turned to account in his philosophy. Hence, as we have seen, the use which he makes of love, even under its most unlawful forms, in the Symposium and the Phaedrus. Now, it would appear, from our scanty sources of information, that social festivities, always very popular at Athens, had become the chief interest in life about the time when Plato was composing his Laws. According to one graceful legend, the philosopher himself breathed his last at a marriage-feast. It may, therefore, have occurred to him that the prevalent tendency could, like the amorous passions of a former generation, be utilised for moral training and made subservient to the very cause with which, at first sight, it seemed to conflict.
TWO:Various other anecdotes of more or less doubtful authenticity are related, showing that the philosopher could generally, though not always, act up to his own ideal of indifference. He lived with his sister, who was a midwife by profession, and patiently submitted to the household drudgery which she unsparingly imposed on him. Once, however, she succeeded in goading him into a passion; and on being rather inoppor141tunely reminded of his professed principles by a bystander, the sceptic tartly replied that a wretched woman like that was no fit subject for a display of philosophical indifference. On another occasion, when taunted for losing his self-possession at the attack of a furious dog, he observed, with truth, that, after all, philosophers are human beings.228(1.) Why cannot the parts of machinery be made to accurate dimensions by forging or casting?(2.) What is the difference between hand tool and machine tool operation as to truth?(3.) Why cannot hand-work be employed in duplicating the parts of machinery?(4.) What is the difference between standard and special machine tools?
THREE:
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