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      Celebrate Math Awareness Month

      Scientific American April 27, 1901

      Searchlight Signaling at the Pan-American Exposition

      from the Electric Tower of the Exposition to the Observation Tower at Niagara

      • By Obrin E. Dunlap.

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      More in the April 27, 1901 issue of Scientific American
      • Gelatine Reliefs
      • Packwood Turned into Coal
      • Soldering Aluminium
      View Full Contents
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