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      Scientific American July 16, 1881

      The New State Insane Hospital, Near Norristown, Pennsylvania

      • July 16, 1881

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      More in the July 16, 1881 issue of Scientific American
      • An Experiment with the Induction Balance
      • Double-Action Mercurial Air-Pump
      • Lohse's Method of Preparing Emulsion
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