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      Scientific American September 1922

      An Automatic Hand on the Throttle

      Principle and Features of the Sprague System of Automatic Train Control

      • By S. G. Roberts on September 1, 1922

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      More in the September 1922 issue of Scientific American
      • Concrete-and-Steel Stadium Construction in France, The Window-Cleaning Carriage
      • Electrically Harnessing the Winds
      • Legendary Islands of the Atlantic
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