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FORE:Castings are of course sprung by the action of unequal strains, caused by one part cooling or 'setting' sooner than another. That far all is clear, but the next step takes us into the dark. What are the various conditions which induce irregular cooling, and how is it to be avoided?The bill-poster replied "yes" or "no" to my questions, whichever answer fitted, and as soon as he had finished his task he hurriedly trotted off. I did not see any other inhabitant.

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FORE:

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FORE:

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FORE:Inherent or cooling strains in castings is much more intricate than shrinkage: it is, in fact, one of the most uncertain and obscure matters that pattern-makers and moulders have to contend with. Inherent strains may weaken castings, or cause them to break while cooling, or sometimes even after they are finished; and in many kinds of works such strains must be carefully guarded against, both in the preparation of designs and the arrangement of patterns, especially for wheels and pulleys with spokes, and for struts or braces with both ends fixed. The main difficulty resulting from cooling strains, however, is that of castings being warped and sprung; this difficulty is continually present in the foundry and machine-shop, and there is perhaps no problem in the whole range of mechanical manipulation of which there exists more diversity of opinion and practice than of means to prevent the springing of castings. This being the case, an apprentice can hardly hope for much information here. There is no doubt of springing and strains in castings being the result of constant causes that might be fully understood if it were not for the ever-changing conditions which exist in casting, both as to the form of pieces, the temperature and quality of metal, mode of cooling, and so on.We must mention as an additional point of contrast between the Stoics and the subsequent schools which they most resembled, that while these look on the soul as inseparable from the body, and sharing its fortunes from first to last, although perfectly distinct from it in idea, they emphasised the antithesis between the two just as strongly as Plato, giving the soul an absolutely infinite power of self-assertion during our mortal life, and allowing it a continued, though not an immortal, existence after death.31

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FORE:"Gently, gently," he growled. "Let us look at those gems. I have them here. See, are those the ones you passed over to me?"

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FORE:"That clenches it," he said. "Now where did they hide themselves?"

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