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      Celebrate Math Awareness Month

      Scientific American September 15, 1877

      Mechanical Appliances Used in the Construction of the Heading Under the Severn, for the Severn Tunnel Railway *

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      More in the September 15, 1877 issue of Scientific American
      • A Remarkable Vegetable Poison
      • Cleaning of Plates and Lenses
      • Dyeing Paper with Aniline Colors
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