ONE:Considered mechanically as a means of handling material, the human hands are capable of exerting force in any direction, vertically, horizontally, or at any angle, moving at various rates of speed, as the conditions may require, and with varying force within the limits of human strength. These functions enable us to pick up or lay down a weight slowly and carefully, to transport it at a rapid rate to save time, to move it in any direction, and without the least waste of power, except in the case of carrying small loads, when the whole body has to be moved, as in ascending or descending stairs. The power travelling cranes, that are usually employed in machine-fitting establishments, are perhaps the nearest approach that has been made to the human frame in the way of handling mechanism; they, however, lack that very important feature of a movement, the speed of which is graduated at will. It is evident that in machinery of any kind for handling and lifting that moves at a uniform rate of speed, and this rate of speed adapted, as it must be, to the conditions of starting or depositing a load, much time must be lost in the transit, especially when the load is moved for a considerable distance. This uniform speed is perhaps the greatest defect in the lifting machinery in common use, at least in such as is driven by power.
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FORE:Such was the transaction which some moderns, Grote among the number, holding Socrates to be one of the best and wisest of men, have endeavoured to excuse. Their argument is that the illustrious victim was jointly responsible for his own fate, and that he was really condemned, not for his teaching, but for contempt of court. To us it seems that this is a distinction without a difference. What has been so finely said of space and time may be said also of the Socratic life and the Socratic doctrine; each was contained entire in every point of the other. Such as he appeared to the Dicastery, such also he appeared everywhere, always, and to all men, offering them the truth, the whole truth, and nothing but the truth. If conduct like his was not permissible in a court of law, then it was not permissible at all; if justice could not be administered without reticences, evasions, and disguises, where was sincerity ever to be practised? If reason was not to be the paramount arbitress in questions of public interest, what issues could ever be entrusted to her decision? Admit every extenuating circumstance that the utmost ingenuity can devise, and from every point of view one fact will come out clearly, that Socrates was impeached as a philosopher, that he defended himself like a philosopher, and that he was condemned to167 death because he was a philosopher. Those who attempt to remove this stain from the character of the Athenian people will find that, like the blood-stain on Bluebeards key, when it is rubbed out on one side it reappears on the other. To punish Socrates for his teaching, or for the way in which he defended his teaching, was equally persecution, and persecution of the worst description, that which attacks not the results of free thought but free thought itself. We cannot then agree with Grote when he says that the condemnation of Socrates ought to count as one of the least gloomy items in an essentially gloomy catalogue. On the contrary, it is the gloomiest of any, because it reveals a depth of hatred for pure reason in vulgar minds which might otherwise have remained unsuspected. There is some excuse for other persecutors, for Caiaphas, and St. Dominic, and Calvin: for the Inquisition, and for the authors of the dragonnades; for the judges of Giordano Bruno, and the judges of Vanini: they were striving to exterminate particular opinions, which they believed to be both false and pernicious; there is no such excuse for the Athenian dicasts, least of all for those eighty who, having pronounced Socrates innocent, sentenced him to death because he reasserted his innocence; if, indeed, innocence be not too weak a word to describe his life-long battle against that very irreligion and corruption which were laid to his charge. Here, in this one cause, the great central issue between two abstract principles, the principle of authority and the principle of reason, was cleared from all adventitious circumstances, and disputed on its own intrinsic merits with the usual weapons of argument on the one side and brute force on the other. On that issue Socrates was finally condemned, and on it his judges must be condemned by us.Power derived from water by means of wheels is due to the gravity of the water in descending from a higher to a lower level; but the question arises, What has heat to do with this? If heat is the source of power, and power a product of heat, there must be a connection somewhere between heat and the descent of the water. Water, in descending from one level to another, can give out no more power than was consumed in raising it to the higher level, and this power employed to raise the water is found to be heat. Water is evaporated by heat of the sun, expanded until it is lighter than the atmosphere, rises through the air, and by condensation falls in the form of rain over the earth's surface; then drains into the ocean through streams and rivers, to again resume its round by another course of evaporation, giving out in its descent power that we turn to useful account by means of water-wheels. This principle of evaporation is continually going on; the fall of rain is likewise quite constant, so that streams are maintained within a sufficient regularity to be available for operating machinery.
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FORE:A difficulty which arises in hardening tools is because of the contraction of the steel which takes place in proportion to the change of temperature; and as the time of cooling is in proportion to the thickness or size of a piece, it follows, of course, that there is a great strain and a tendency to break the thinner parts before the thicker parts have time to cool; this strain may take place either from cooling one side first, or more rapidly than another.
