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Features

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

By John Anson Ford

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

Departments

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    Correspondence

  • The Heavens in May, 1921

  • Inventions New and Interesting

  • Recently Patented Inventions

  • New Books, Etc.

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May 1921