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Cores are employed mainly for what may be termed the displacement of metal in moulds. There is no clear line of distinction between cores and moulds, as founding is now conducted; cores may be of green sand, and made to surround the exterior of a piece, as well as to make perforations or to form recesses within it. The term 'core,' in its technical sense, means dried moulds, as distinguished from green sand. Wheels or other castings are said to be cast in cores when the moulds are made in pieces and dried. Supporting and venting cores, and their expansion, are conditions to which especial attention [95] is called. When a core is surrounded with hot metal, it gives off, because of moisture and the burning of the 'wash,' a large amount of gas which must have free means of escape. In the arrangement of cores, therefore, attention must be had to some means of venting, which is generally attained by allowing them to project through the sides of the mould and communicate with the air outside.Following this proposition into modern engineering examples, we find how practice has gradually conformed to what these properties in belts suggest. Wire and other ropes of small diameter, to avoid air friction, and allowed to droop in low curves to avoid too many supporting pulleys, are now in many cases employed for transmitting power through long distances, as at Schaffhausen, in Germany. This system has been very successfully applied in some cases for distributing power in large manufacturing establishments. Belts, among which are included all flexible bands, do not afford the same facilities for [49]taking off power at different points as shafts, but have advantages in transmitting power to portable machinery, when power is to be taken off at movable points, as in the case of portable travelling cranes, machines, and so on.
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Apart from legendary reputations, there is no name in the worlds 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 armourers workshop, in the sculptors 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.80The Red Cross Service was well arranged, the wounded were transported regularly, a large number of motor-cars being used.Before leaving we went back to the hotel for breakfast. Thereit was a first-class hotelthey gave us an apology for coffee, without milk or sugar, and two flimsy pieces of bread, as hard as wood and as black as shoe-polish. I was intensely hungry, and as nowhere at Charleroi anything else could be had, I did my best with the wooden bread and succeeded in washing it down with much chewing and jawing. But the sweet, hard stuff did not suit my digestion, and I felt ill already when at six o'clock we got into the motor-car and left for Dinant.
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