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FORE:A planing machine invented by Mr Bodmer in 1841, and since improved by Mr William Sellers of Philadelphia, is free from this elastic action of the platen, which is moved by a tangent wheel or screw pinion. In Bodmer's machine the shaft carrying the pinion was parallel to the platen, but in Sellers' machine is set on a shaft with its axis diagonal to the line of the platen movement, so that the teeth or threads of the pinion act partly by a screw motion, and partly by a progressive forward movement like the teeth of wheels. The rack on the platen of Mr Sellers' [134] machine is arranged with its teeth at a proper angle to balance the friction arising from the rubbing action of the pinion, which angle has been demonstrated as correct at 5°, the ordinary coefficient of friction; as the pinion-shaft is strongly supported at each side of the pinion, and the thrust of the cutting force falls mainly in the line of the pinion shaft, there is but little if any elasticity, so that the motion is positive and smooth.

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FORE:The time arrived when this last liberty was to be taken away. In the year 529, Justinian issued his famous decree prohibiting the public teaching of philosophy in Athens, and confiscating the endowments devoted to the maintenance of its professors. It is probable that this measure formed part of a comprehensive scheme for completing the extirpation of paganism throughout the empire. For some two centuries past, the triumph of Christianity had been secured by an unsparing exercise of the imperial authority, as the triumph of Catholicism over heresy was next to be secured with the aid of the Frankish sword. A few years afterwards, the principal representatives of the Neo-Platonic school, including the Damascius of whom we have already spoken, and Simplicius,361 the famous Aristotelian commentator, repaired to the court of Khosru Nuschirvan, the King of Persia, with the intention of settling in his country for the rest of their lives. They were soon heartily sick of their adopted home. Khosru was unquestionably an enlightened monarch, greatly interested in Hellenic culture, and sincerely desirous of diffusing it among his people. It is also certain that Agathias, our only authority on this subject, was violently prejudiced against him. But it may very well be, as stated by that historian530 that Khosru by no means came up to the exaggerated expectations formed of him by the exiled professors. He had been described to them as the ideal of a Platonic ruler, and, like inexperienced bookmen, they accepted the report in good faith. They found that he cared a great deal more for scientific questions about the cause of the tides and the modifications superinduced on plants and animals by transference to a new environment, than about the metaphysics of the One.531 Moreover, the immorality of Oriental society and the corruption of Oriental government were something for which they were totally unprepared. Better, they thought, to die at once, so that it were but on Roman soil, than to live on any conditions in such a country as Persia. Khosru was most unwilling to lose his guests, but on finding that they were determined to leave him, he permitted them to depart, and even made it a matter of express stipulation with the imperial government that they should be allowed to live in their old homes without suffering any molestation on account of their religious opinions.532Plato does, no doubt, make it a charge against the Sophists that their doctrines are not only false and immoral, but that they are put together without any regard for logical coherence. It would seem, however, that this style of attack belongs rather to the later and constructive than to the earlier and receptive period of his intellectual development. The original cause of his antagonism to the professional teachers seems to have been their general pretensions to knowledge, which, from the standpoint of universal scepticism, were, of course, utterly illusive; together with a feeling of aristocratic contempt for a calling in which considerations of187 pecuniary interest were involved, heightened in this instance by a conviction that the buyer received nothing better than a sham article in exchange for his money. Here, again, a parallel suggests itself with the first preaching of the Gospel. The attitude of Christ towards the scribes and Pharisees, as also that of St. Paul towards Simon Magus, will help us to understand how Plato, in another order of spiritual teaching, must have regarded the hypocrisy of wisdom, the intrusion of fraudulent traders into the temple of Delphic inspiration, and the sale of a priceless blessing whose unlimited diffusion should have been its own and only reward.

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