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Published online by Cambridge University Press: 15 September 2014
This paper first treats of the composition and properties of the different kinds of iron, known as wrought iron, steel, and cast iron, and especially of the changes which steel undergoes on being heated to redness and then suddenly cooled by plunging it into water, mercury, or oil, and known as hardening; also of the peculiar property known as tempering, by which the hardness and brittleness can be removed.