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      Knowledge is Power

      Scientific American April 26, 1890

      The Path of the Point of Contact of the Teeth of Gear Wheels

      • By W.F. Durand on April 26, 1890

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      More in the April 26, 1890 issue of Scientific American
      • A Unique Archæological Relic
      • Compressed air Tramcar Propulsion
      • Note on a New Triple Bunsen Burner
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