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      Knowledge is Power

      Scientific American February 13, 1892

      The Military Engineer and his Work

      • By W. R. King on February 13, 1892

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      More in the February 13, 1892 issue of Scientific American
      • A New Laboratory Process for Preparing Hydrobromic Acid
      • Chlorine Gas and Soda by the Electrolytic Process
      • How Enameled Letters are Made
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