CHAPTER L. / r JUDGING OF AND TESTING MOLTEN f IRON. In testing iron we have two properties, chemical and physical, to which we might add the phenomenon of | fusion. An experienced eye can often very fairly tell ? what a casting will be, physically, by judging the I appearance of the metal when running or at rest in a ladle. f In many cases the ability to judge liquid metal [ will often prove of value, for while we seldom have means for changing its character when, fluid, we can "^ often refrain from pouring work when our judgment ! asserts that a metal is radically wrong. There is ] this much that can be said of re-melted fluid iron: It ' will rarely, if ever, deceive an expert, as can the judg- « ing of iron in the pig before being melted. We can rest assured that if it looks radically soft in a liquid state, it will not prove hard in a solid one, and vice \ versa. ! The ordinary moulder can, with a short experience, ; tell the degree of fluidity, or whether the iron is » " hot " or " dull/' Why he should be better able to r-.j* do this than judge of its physical qualities When mol- f ten, is mainly due to present practice not often afford- f ing means to change or correct a metal that might not * look right. The degree of the temperature before 1 intelligently nianijmluU'u.ounders have had opportunity for experience in crucible work, we will detail more pointsbe found a cheap temporary arrangement for melting from fifty to one hundred pounds of iron, Ferrochrom.