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      Knowledge is Power

      Scientific American April 09, 1892

      A Rapid Method of Determining the Composition of Lubricating Oils

      • By Harold Gripper on April 9, 1892

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      More in the April 09, 1892 issue of Scientific American
      • A New Telescopic Photographic Lens
      • Different Methods of Tinning
      • Italian Experience with the Pasteur Method for Hydrophobia
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