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      Celebrate Math Awareness Month

      Scientific American February 1868

      Nitro-Glycerin--Its use, Its Danger--Who Shall Decide when Experts Disagree?

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      More in the February 1868 issue of Scientific American
      • Cumbrousness of Tools for Iron Working
      • Use of Screw, Plates--Tempering Saws for Machinists' Use
      • Answers to Correspondents
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