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      Knowledge is Power

      Scientific American February 1922

      Measuring in Millionths

      The Latest Recording Ultramicrometer, a Device with Instantaneous Action

      • February 1, 1922

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      More in the February 1922 issue of Scientific American
      • Science Notes, February 1922
      • The Latest African Anthropological Find
      • The Voice With the Nation-Wide Audience
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