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The means of supporting cores must be devised, or at least understood, by pattern-makers; these supports consist of 'prints' and 'anchors.' Prints are extensions of the cores, which project through the casting and extend into the sides of the mould, to be held by the sand or by the flask. The prints of cores have duplicates on the patterns, called core prints, which are, or should be, of a different colour from the patterns, so as to distinguish one from the other. The amount of surface required to support cores is dependent upon their weight, or rather upon their cubic contents, because the weight of a core is but a trifling matter [96] compared to its floating force when surrounded by melted metal. An apprentice in studying devices for supporting cores must remember that the main force required is to hold them down, and not to bear their weight. The floating force of a core is as the difference between its weight and that of a solid of metal of the same sizea matter moulders often forget to consider. It is often impossible, from the nature of castings, to have prints large enough to support the cores, and it is then effected by anchors, pieces of iron that stand like braces between the cores and the flasks or pieces of iron imbedded in the sand to receive the strain of the anchors.

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THREE:(1.) What causes tools to bend or break in hardening?(2.) What means can be employed to prevent injury to tools in hardening?(3.) Can the shades of temper be produced on a piece of steel without hardening?(4.) What forms a limit of hardness for cutting tools?(5.) What are the objects of steel-laying tools instead of making them of solid steel?All these, however, are mere questions of detail. It is on a subject of the profoundest philosophical importance that Aristotle differs most consciously, most radically, and most fatally from his predecessors. They were evolutionists, and he was a stationarist. They were mechanicists, and he was a teleologist. They were uniformitarians, and he was a dualist. It is true that, as we mentioned at the beginning of this chapter, Mr. Edwin Wallace makes him recognise the genesis of things by evolution and development, but the meaning of this phrase requires to be cleared up. In one sense it is, of course, almost an identical proposition. The genesis of things must be by genesis of some kind or other. The great question is, what things have been evolved, and how have they been evolved? Modern science tells us, that not only have all particular aggregates of matter and motion now existing come into being within a finite period of time, but also that the specific types under which we arrange those aggregates have equally been generated; and that their characteristics, whether structural or functional, can only be understood by tracing out their origin and history. And it further teaches us that the properties of every aggregate result from the properties of its ultimate elements, which, within the limits of our experience, remain absolutely unchanged. Now, Aristotle taught very nearly the contrary of all this. He believed that the cosmos, as we now know it, had existed, and would continue to exist, unchanged through all eternity. The sun, moon, planets, and stars, together with the orbs containing them, are composed of an absolutely ungenerable, incorruptible substance. The earth, a cold, heavy, solid sphere, though liable to superficial changes, has always occupied its present position in the centre of the universe.317 The specific forms of animal lifeexcept a few which are produced spontaneouslyhave, in like manner, been preserved unaltered through an infinite series of generations. Man shares the common lot. There is no continuous progress of civilisation. Every invention and discovery has been made and lost an infinite number of times. Our philosopher could not, of course, deny that individual living things come into existence and gradually grow to maturity; but he insists that their formation is teleologically determined by the parental type which they are striving to realise. He asks whether we should study a thing by examining how it grows, or by examining its completed form: and Mr. Wallace quotes the question without quoting the answer.203 Aristotle tells us that the genetic method was followed by his predecessors, but that the other method is his. And he goes on to censure Empedocles for saying that many things in the animal body are due simply to mechanical causation; for example, the segmented structure of the backbone, which that philosopher attributes to continued doubling and twistingthe very same explanation, we believe, that would be given of it by a modern evolutionist.204 Finally, Aristotle assumes the only sort of transformation which we deny, and which Democritus equally deniedthat is to say, the transformation of the ultimate elements into one another by the oscillation of an indeterminate matter between opposite qualities.

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TWO:It is strange, considering the simplicity of construction and the very important office filled by machines for cutting on plane surfaces, that they were not sooner invented and applied in metal work. Many men yet working at finishing, can remember when all flat surfaces were chipped and filed, and that long after engine lathes had reached a state of efficiency and were generally employed, planing machines were not known. This is no doubt to be accounted for in the fact that reciprocal movement, except that produced by cranks or eccentrics, was unknown or regarded as impracticable for useful purposes until late years, and when finally applied it was thought impracticable to have such movements operate automatically. This may seem quite absurd to even an apprentice of the present time, yet such reciprocating movement, as a mechanical problem, is by no means so simple as it may at first appear.Leona smiled scornfully. She had no fear of that.

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Charlton did so. There was a blank surprise on his face.The implications of such an ethical standard are, on the whole, conservative; it is assumed that social institutions are, taking them altogether, nearly the best possible at any moment; and that our truest wisdom is to make the most of them, instead of sighing for some other sphere where our grand aspirations or volcanic passions might find a readier outlet for their feverish activity. And if the teaching of the first Stoics did not take the direction here indicated, it was because they, with the communistic theories inherited from their Cynic predecessors, began by condemning all existing social distinctions as irrational. They wished to abolish local religion, property, the family, and the State, as a substitute for which the whole human race was to be united under a single government, without private possessions or slaves, and with a complete community of women and children.79 It must, however, have gradually dawned on them that such a radical subversion of the present system was hardly compatible with their belief in the providential origin of all things; and that, besides this, the virtues which they made it so much their object to recommend, would be, for the most part, superfluous in a communistic society. At the same time, the old notion of S?phrosyn as a virtue which consisted in minding ones own business, or, stated more generally, in discerning and doing whatever work one is best fitted for, would continue to influence ethical teaching, with the effect of giving more and more individuality to the definition of duty. And the36 Stoic idea of a perfect sage, including as it did the possession of every accomplishment and an exclusive fitness for discharging every honourable function, would seem much less chimerical if interpreted to mean that a noble character, while everywhere intrinsically the same, might be realised under as many divergent forms as there are opportunities for continuous usefulness in life.80
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