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      Knowledge is Power

      Scientific American November 06, 1909

      Recent Progress in Chemistry

      New Theories of the Structure of the Elements

      • By H. E. Armstrong on November 6, 1909

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      More in the November 06, 1909 issue of Scientific American
      • Electrical Notes
      • The Loetschberg Tunnel through the Bernese Alps
      • The Pneumatic Tire and the Aeroplane
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