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      Knowledge is Power

      Scientific American February 21, 1891

      Transmission of Messages through the Air by Electricity without Wires

      • By John Trowbridge on February 21, 1891

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      More in the February 21, 1891 issue of Scientific American
      • Building Plans and Specifications
      • Photographic Equatorial Telescope
      • Wire Ropeways, with Notes on the Plomosas Line
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