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      Scientific American February 21, 1914

      Fresh Air in Schoolrooms

      Cloth Window Screens that let in Plenty of Filtered Air without Drafts

      • By John B. Todd on February 21, 1914

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      More in the February 21, 1914 issue of Scientific American
      • The Iron Blast Furnace and the Characteristics of its Fuels—II
      • A New Device Adopted by French Omnibus Companies
      • Safety of Life at Sea
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