Skip to main content
Scientific American
  • Cart 0
  • Forgot password?Loading
    Not yet registered?
  • |Newsletters
Advanced Search
  • COVID
  • Health
  • Mind & Brain
  • Environment
  • Technology
  • Space & Physics
  • Video
  • Podcasts
  • Opinion
  • Store
  • Subscribe
  • Current Issue
  • Cart0
  • Sign In
  • Newsletters
      • Share
      • Latest

      Knowledge is Power

      Scientific American July 31, 1920

      The Heavens in August, 1920

      The Mechanism of the Tides, and How Their Heights and Times Are Predicted

      • By Henry Norris Russell on July 31, 1920

      This is a preview. Make a selection below to access this issue.Already have access? Sign in.

      Having trouble accessing this article? Please visit our FAQ page for more information

      More in the July 31, 1920 issue of Scientific American
      • How a Road Rests in its Bed, Soap from Lignite Tar Oils
      • Our Mechanical Eyes
      • Inventions New and Interesting - July 31, 1920
      View Full Contents
      Visit our Librarian Gateway for additional information on purchasing a site license to this and other products

      Support Science Journalism

      Discover world-changing science. Explore our digital archive back to 1845, including articles by more than 150 Nobel Prize winners.

      Subscribe Now!Support Science Journalism

      Follow us

      • instagram
      • soundcloud
      • youtube
      • twitter
      • facebook
      • rss

      Scientific american arabic

      العربية
      • Return & Refund Policy
      • About
      • Press Room
      • FAQs
      • Contact Us
      • Site Map
      • Advertise
      • SA Custom Media
      • Terms of Use
      • Privacy Policy
      • California Consumer Privacy Statement
      • Use of cookies/Do not sell my data
      • International Editions
      Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www.springernature.com/us). Scientific American maintains a strict policy of editorial independence in reporting developments in science to our readers.

      © 2023 Scientific American, a Division of Springer Nature America, Inc.

      All Rights Reserved.

      Scroll To Top

      Support science journalism.

      Scientific American paper issue and on tablet

      Thanks for reading Scientific American. Knowledge awaits.

      Already a subscriber? Sign in.

      Thanks for reading Scientific American. Create your free account or Sign in to continue.

      Create Account

      See Subscription Options

      Continue reading with a Scientific American subscription.

      You may cancel at any time.

      Sign in.