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      Digital & 4-Year Archive

      Scientific American April 16, 1881

      Simplified Holtz Electrical Machine

      • By Geo M. Hopkins on April 16, 1881

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      More in the April 16, 1881 issue of Scientific American
      • Lavater's Apparatus for Taking Silhouettes
      • Notes and Queries
      • The Reese Fusion Disk
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