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      Celebrate Math Awareness Month

      Scientific American July 03, 1915

      The Machinery of Modern Submarines

      Various Motor Types

      • By A. P. Chalkley

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      More in the July 03, 1915 issue of Scientific American
      • A Combined Bolt and Lock-nut, Sculptor's Pneumatic Chisel and more
      • Notes and Queries - July 3, 1915
      • The How and Why of the V-Type Motor
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