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      Scientific American September 26, 1885

      Optical Telegraphy

      Cryptography.—Preservation Of Telegrams

      • September 26, 1885

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      More in the September 26, 1885 issue of Scientific American
      • Automatic Siphon for Irrigation
      • M. Meizel's Reciprocating Exhauster
      • The Cabbage Butterfly
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