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      Knowledge is Power

      Scientific American March 13, 1909

      Construction of a Selenium Cell

      • By J. Carlton Paulmier on March 13, 1909

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      More in the March 13, 1909 issue of Scientific American
      • A Wirelessly-Controlled Torpedo
      • Electricity - March 13, 1909
      • Home-Made Brass Furnace
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