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      Scientific American September 28, 1912

      Testing Lubricants

      A Machine for Studying Them Under Actual Working Conditions

      • September 28, 1912

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      More in the September 28, 1912 issue of Scientific American
      • Celestial Motions Considered on the Principle of Relativity
      • The Bubonic Plague—I
      • Electrolysis from Stray Currents—II
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