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      Knowledge is Power

      Scientific American September 19, 1914

      Wireless Communication and Aeronautics

      Facts Relating to Light Portable Apparatus

      • September 19, 1914

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      More in the September 19, 1914 issue of Scientific American
      • Activity of Freshly Formed Radium Emanation
      • Iron Shielded from Earth's Magnetism
      • Steering Vessels by Electricity
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