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      Knowledge is Power

      Scientific American March 27, 1880

      On the Hardening, Tempering, and Annealing of Steel

      I.—Nature and Composition of Steel and Cast Iron

      • March 27, 1880

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      More in the March 27, 1880 issue of Scientific American
      • Electric Railway Brake
      • On an Unusual Case of Electrolysis
      • The Essential Nature of Electricity
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