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      Scientific American June 24, 1911

      Our National Earthquake Recorder

      Feeling the Earth's Pulse

      • By Emma M. V. Triepel on June 24, 1911

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      More in the June 24, 1911 issue of Scientific American
      • A Good Glue Clamp
      • How I Invented the Air Brake--II, Legal Notes
      • Longer Piers for Giant Steamships
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