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Steel low in carbon; mild steel; ingot iron.

extreme hardness supported by material gradually decreasing in hardness to the unaltered soft steel at the back.

tiplying facsimiles of an engraved steel plate by first rolling over it, when hardened, a soft steel cylinder, and then rolling the cylinder, when hardened, over a soft steel plate, which thus becomes a facsimile of the original. The process has been superseded by electrotypy.