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      Knowledge is Power

      Scientific American April 30, 1887

      Principles and Practice of Ornamental Design

      Lecture IV

      • By Lewis Foreman Day on April 30, 1887

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      More in the April 30, 1887 issue of Scientific American
      • Electrolysis of Copper and Zinc
      • Stiffened Suspension Bridges
      • The Telephone and Photophone
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