ONE: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.
TWO:"Here's a discovery," he said, excitedly. "Here's a perfect revelation. Mr. Charlton, will you trust me for four and twenty hours with this letter? I've found out something that fairly takes my breath away.""That you shall know all in good time," Lawrence replied. "It's a pleasure to have you to do anything for one, Hetty. How quickly you took in my parable. It was rather paltry to talk over a child's head like that, but if ever there was a case when the end justifies the means this is one. Of course, you got it?"
FORE:The little room was at the top facing the blank windows of the Corner House. Hetty had no difficulty in finding the box, and a very brief search showed the address she was looking for. The box she emptied in the grate and set fire to the contents with a match she had brought for the purpose.
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