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      Knowledge is Power

      Scientific American May 31, 1890

      The use of Hydrocyanic Acid Gas for the Destruction of the Red Scale

      • By D.W. Coquillett on May 31, 1890

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      More in the May 31, 1890 issue of Scientific American
      • Analyses of some American Fire Clays
      • Feodossieff's New Method of Tempering and Hardening Steel for Cannon and Projectiles
      • Light Batteries
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