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      Scientific American September 12, 1914

      Electric Mine Gas Detectors

      Different Devices that Have Been Used or Suggested to Test for Gas with an Electric Lamp

      • By Sydney F. Walker on September 12, 1914

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      More in the September 12, 1914 issue of Scientific American
      • A New Way of Selling
      • Man's Chin
      • Refractive Index of Radium Emanations
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