ALL who are concerned with the manufacture of components from steel have from time to time met mysterious instances of the material proving unwontedly intractable and displaying qualities quite inexplicable if it were correct to specification. This has usually proved to be due, on analysis, to the inclusion of an unwanted element in the process of mixing for melting—due, in its turn, to careless picking up of a wrong type of steel from the available scrap. Theoretically, of course, in a perfectly organized works this should not be possible; but in war conditions, with inexperienced personnel too often having to be employed on work for which they are insufficiently trained, it does undoubtedly happen.
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