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      Knowledge is Power

      Scientific American August 10, 1918

      Notes on Testing Hardness of Metals

      The Right Use and Application of Methods

      • By J.W. Craggs on August 10, 1918

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      More in the August 10, 1918 issue of Scientific American
      • Anomalies in the Animal World—Part XII
      • Map Making for the Army
      • Radiotelegraphy
      View Full Contents
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