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      Scientific American August 14, 1886

      On the Sounds Produced in a Metallic Disk or Cord by Electric Discharges

      • By E. Semmola on August 14, 1886

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      More in the August 14, 1886 issue of Scientific American
      • A Lecture Experiment for Showing the Composition by Volume of Nitrous and Nitric Oxides
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      • Mining Coal by Hydraulic Means
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