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Features

Stopping the Chimney Thief, How the Einstein Contest Worked and more

By Charles C. Phelps

Stunts of the Stage

By Harry A. Mount

The World War on Rats

By George Gaulois

Relativity

The Winning Essay for the Eugene Higgins Five Thousand Dollar Prize

By Zodiaque

Some Einstein Contest Personalities

By the Einstein Editor

The Big Dam on the Little San Diego

A Multiple-Arch Structure of Unusual Height and Some of the Principles Involved in its Construction

By J. F. Springer

Artificial Ammonia

The Claude Process, Now in Successful Operation in France

By Jacques Boyer

Departments

  • Open Roads All Winter

  • Departments

    The Heavens in February, 1921

  • Inventions New and Interesting

  • Recently Patented Inventions

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February 1921

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