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      Knowledge is Power

      Scientific American April 08, 1916

      The Surface-Tension at the Interface between Two Liquids

      • By William D. Harkins, E. C. Humphery on April 8, 1916

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      More in the April 08, 1916 issue of Scientific American
      • Ancient Principles of Physiognomy
      • The Ignition of Explosive Gas Mixtures by Electric Sparks
      • The Washington Navy Yard Wind Tunnel
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