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      Scientific American April 08, 1905

      The Construction of a Four-Inch Spark Induction Coil

      • By Thomas R. Hopper on April 8, 1905

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      More in the April 08, 1905 issue of Scientific American
      • Cocoons that Yield Colored Silk
      • Idle Hours in Cæsar's City
      • Rain: Its Cause
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