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      Scientific American April 27, 1889

      ”Platino-Uranotype“and “Mercuro-Uranotype,” Two New Uranium Printing Processes

      • April 27, 1889

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      More in the April 27, 1889 issue of Scientific American
      • Paris Exposition-Elevators at the Eiffel Tower
      • The “Sturmer” Chess Board and Magic Squares
      • Arc Lamps and their Mechanism
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