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      Scientific American July 26, 1913

      The Voices of the Deaf

      Graphic Records of Speech

      • By E. W. Scripture on July 26, 1913

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      More in the July 26, 1913 issue of Scientific American
      • Improving the Quality of Aluminium
      • The Intrinsic Brilliancy of the Glow Worm
      • Moving Picture Records of a Building in Construction
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