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      Knowledge is Power

      Scientific American June 26, 1915

      The Heavens in July

      A Hundred and Twenty Thousand Years Hence the Tides will have Lengthened Our Day by One Second

      • By Henry Norris Russell on June 26, 1915

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      More in the June 26, 1915 issue of Scientific American
      • Electric Remote Gages for Shooting Ranges
      • The Instrumental Study of the Heart
      • The Naval and Military Exhibit of the National Security League
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