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America's Greatest Dam

The Muscle Shoals Project on Which Congressional Economy Is About to Force a Halt

By W. B. West

Looking Backward Four Thousand Years

The Story of a Digger's Luck That Opened an Egyptian Wonder House

By Albert A. Hopkins

Fuel Conservation Opinions--I

What Leading Consumers of Fuel Have to Say About the Present and the Future

By Austin C. Lescarboura

Cold Vulcanization of Rubber

A New English Process with Many Advantages Over the Old Ones

By F. Rowlinson

Machine-Made Window Glass

How the Great Sheets of This Difficult Material Are Made and Handled

By Robert G. Skerrett

How to Tell Birch, Beech and Maple Apart


  • Tilting Grain Cars in All Directions to Empty Them, The Roger Bacon Manuscript and more

  • Departments


  • The Heavens in May, 1921

  • Inventions New and Interesting

  • Recently Patented Inventions

  • New Books, Etc.

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May 1921

See the World from a Different Perspective

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