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THREE:The term gearing, which was once applied to wheels, shafts, and the general mechanism of mills and factories, has now in common use become restricted to tooth wheels, and is in this sense employed here. Gearing as a means of transmitting motion is employed when the movement of machines, or the parts of machines, must remain relatively the same, as in the case of the traversing screw of an engine lathe��when a heavy force is transmitted between shafts that are near to each other, or when shafts to be connected are arranged at angles with each other. This rule is of course not constant, except as to cases where positive relative motion has to be maintained. Noise, and the liability to sudden obstruction, may be reasons for not employing tooth wheels in many cases when the distance between and the position of shafts would render such a connection the most durable and cheap. Gearing under ordinary strain, within limited speed, and when other conditions admit of its use, is the cheapest and most durable mechanism for transmitting power; but the amount of gearing employed in machinery, especially in Europe, is no doubt far greater than it will be in future, when belts are better understood.Apart from legendary reputations, there is no name in the world��s history more famous than that of Socrates, and in the history of philosophy there is none so famous. The only thinker that approaches him in celebrity is his own disciple Plato. Every one who has heard of Greece or Athens has heard of him. Every one who has heard of him knows that he was supremely good and great. Each successive generation has confirmed the reputed Delphic oracle that no man was wiser than Socrates. He, with one or two others, alone came near to realising the ideal of a Stoic sage. Christians deem it no irreverence to compare him with the Founder of their religion. If a few dissentient voices have broken the general unanimity, they have, whether consciously or not, been inspired by the Socratic principle that we should let no opinion pass unquestioned and unproved. Furthermore, it so happens that this wonderful figure is known even to the multitude by sight as well as by name. Busts, cameos, and engravings have made all familiar with the Silenus-like physiognomy, the thick lips, upturned nose, and prominent eyes which impressed themselves so strangely on the imagination of a race who are accused of having cared for nothing but physical beauty, because they rightly regarded it as the natural accompaniment of moral loveliness. Those who wish to discover what manner of mind lay hid beneath this uninviting109 exterior may easily satisfy their curiosity, for Socrates is personally better known than any other character of antiquity. Dr. Johnson himself is not a more familiar figure to the student of literature. Alone among classical worthies his table-talk has been preserved for us, and the art of memoir-writing seems to have been expressly created for his behoof.79 We can follow him into all sorts of company and test his behaviour in every variety of circumstances. He conversed with all classes and on all subjects of human interest, with artisans, artists, generals, statesmen, professors, and professional beauties. We meet him in the armourer��s workshop, in the sculptor��s studio, in the boudoirs of the demi-monde, in the banqueting-halls of flower-crowned and wine-flushed Athenian youth, combining the self-mastery of an Antisthenes with the plastic grace of an Aristippus; or, in graver moments, cheering his comrades during the disastrous retreat from Delium; upholding the sanctity of law, as President of the Assembly, against a delirious populace; confronting with invincible irony the oligarchic terrorists who held life and death in their hands; pleading not for himself, but for reason and justice, before a stupid and bigoted tribunal; and, in the last sad scene of all, exchanging Attic courtesies with the unwilling instrument of his death.80