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FORE:Machine-drawing may in some respects be said to bear the same relation to mechanics that writing does to literature; persons may copy manuscript, or write from dictation, of what they do not understand; or a mechanical draughtsman may make drawings of a machine he does not understand; but neither such writing or drawing can have any value beyond that of ordinary labour. It is both necessary and expected that a draughtsman shall understand all the various processes of machine construction, and be familiar with the best examples that are furnished by modern practice.

FORE:Although a system but recently developed, the employment of hydraulic machinery for transmitting and applying power has reached an extended application to a variety of purposes, and gives promise of a still more extensive use in future. Considered as a means of transmitting regularly a constant amount [54] of power, water apparatus is more expensive and inferior in many respects to belts or shafts, and its use must be traced to some special principle involved which adapts hydraulic apparatus to the performance of certain duties. This principle will be found to consist in storing up power in such a manner that it may be used with great force at intervals; and secondly, in the facilities afforded for multiplying force by such simple mechanism as pumps. An engine of ten-horse-power, connected with machinery by hydraulic apparatus, may provide for a force equal to one hundred horse-power for one-tenth part of the time, the power being stored up by accumulators in the interval; or in other words, the motive power acting continuously can be accumulated and applied at intervals as it may be required for raising weights, operating punches, compressive forging, or other work of an intermittent character. Hydraulic machinery employed for such purposes is more simple and inexpensive than gearing and shafts, especially in the application of a great force acting for a considerable distance, and where a cylinder and piston represent a degree of strength which could not be attained with twice the amount of detail, if gearing, screws, levers, or other devices were employed instead.This Daemonium, whatever it may have been, formed one of the ostensible grounds on which its possessor was prosecuted and condemned to death for impiety. We might have spared ourselves the trouble of going over the circumstances connected with that tragical event, had not various attempts been made in some well-known works to extenuate the significance of a singularly atrocious crime. The case stands thus. In the year 399 B.C. Socrates, who was then over seventy, and had never in his life been brought before a law-court, was indicted on the threefold charge of introducing new divinities, of denying those already recognised by the State, and of corrupting young men. His principal accuser was one Mel��tus, a poet, supported by Lycon, a rhetorician,162 and by a much more powerful backer, Anytus, a leading citizen in the restored democracy. The charge was tried before a large popular tribunal, numbering some five hundred members. Socrates regarded the whole affair with profound indifference. When urged to prepare a defence, he replied, with justice, that he had been preparing it his whole life long. He could not, indeed, have easily foreseen what line the prosecutors would take. Our own information on this point is meagre enough, being principally derived from allusions made by Xenophon, who was not himself present at the trial. There seems, however, no unfairness in concluding that the charge of irreligion neither was nor could be substantiated. The evidence of Xenophon is quite sufficient to establish the unimpeachable orthodoxy of his friend. If it really was an offence at Athens to believe in gods unrecognised by the State, Socrates was not guilty of that offence, for his Daemonium was not a new divinity, but a revelation from the established divinities, such as individual believers have at all times been permitted to receive even by the most jealous religious communities. The imputation of infidelity, commonly and indiscriminately brought against all philosophers, was a particularly unhappy one to fling at the great opponent of physical science, who, besides, was noted for the punctual discharge of his religious duties. That the first two counts of the indictment should be so frivolous raises a strong prejudice against the third. The charges of corruption seem to have come under two heads��alleged encouragement of disrespect to parents, and of disaffection towards democratic institutions. In support of the former some innocent expressions let fall by Socrates seem to have been taken up and cruelly perverted. By way of stimulating his young friends to improve their minds, he had observed that relations were only of value when they could help one another, and that to do so they must be properly educated. This was twisted into an assertion that ignorant parents might properly be placed163 under restraint by their better-informed children. That such an inference could not have been sanctioned by Socrates himself is obvious from his insisting on the respect due even to so intolerable a mother as Xanthipp��.108 The political opinions of the defendant presented a more vulnerable point for attack. He thought the custom of choosing magistrates by lot absurd, and did not conceal his contempt for it. There is, however, no reason for believing that such purely theoretical criticisms were forbidden by law or usage at Athens. At any rate, much more revolutionary sentiments were tolerated on the stage. That Socrates would be no party to a violent subversion of the Constitution, and would regard it with high disapproval, was abundantly clear both from his life and from the whole tenor of his teaching. In opposition to Hippias, he defined justice as obedience to the law of the land. The chances of the lot had, on one memorable occasion, called him to preside over the deliberations of the Sovereign Assembly. A proposition was made, contrary to law, that the generals who were accused of having abandoned the crews of their sunken ships at Arginusae should be tried in a single batch. In spite of tremendous popular clamour, Socrates refused to put the question to the vote on the single day for which his office lasted. The just and resolute man, who would not yield to the unrighteous demands of a crowd, had shortly afterwards to face the threats of a frowning tyrant. When the Thirty were installed in power, he publicly, and at the risk of his life, expressed disapproval of their sanguinary proceedings. The oligarchy, wishing to involve as many respectable citizens as possible in complicity with their crimes, sent for five persons, of whom Socrates was one, and ordered them to bring a certain Leo from Salamis, that he might be put to death; the others obeyed, but Socrates refused to accompany them on their disgraceful errand. Nevertheless, it told heavily against the philosopher that164 Alcibiades, the most mischievous of demagogues, and Critias, the most savage of aristocrats, passed for having been educated by him. It was remembered, also, that he was in the habit of quoting a passage from Homer, where Odysseus is described as appealing to the reason of the chiefs, while he brings inferior men to their senses with rough words and rougher chastisement. In reality, Socrates did not mean that the poor should be treated with brutality by the rich, for he would have been the first to suffer had such license been permitted, but he meant that where reason failed harsher methods of coercion must be applied. Precisely because expressions of opinion let fall in private conversation are so liable to be misunderstood or purposely perverted, to adduce them in support of a capital charge where no overt act can be alleged, is the most mischievous form of encroachment on individual liberty.