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In the vise work in iron, the chief requirements are these: 1, given a block of cast iron 4 in. by 2 in. by 1½ in. in thickness, to reduce the thickness ¼ in. by chipping, and then finishing with the file; 2, to file a round hole square; 3, to file a round hole into elliptical; 4, given a 3 in. cube of wrought iron, to cut a spline 3 in. by 3/8 in. by ¼ in., and second, when the under side ...