Nature of Steek-Before proceeding with this description I shall briefly remark upon the nature of steel and the methods by which it has hitherto been produced. Steel.-Steel is generally regarded as a compound of iron and carbon, possessing the remarkab Ze quality of becoming exceeding Z y hard when heated and suddenly cooled. The propoi-tion of carbon determines the degree of hardness of which the steel is capable, or what is termed its temper. The following table of the percentage of carbon in steel suited t o different purposes, is prepared from analyses made in my laboratory by Mr. A. Willis, unless another authority h mentioned.
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