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Water Supply of the Panama Canal

By Crede Haskins Calhoun

The Loss of "ZR-2," Uncharted Perils of the Road and more

Our "ZR-2" Airship and its Shed

Some Details of the Giant Dirigible and the Huge Hangar To Be Used by the U. S. Navy

By George H. Dacy

The Motor Clipper

A Motor Sailing Ship That Can Compete with the Ocean-Going Tramp Steamer

By C. O. Liljegren

Industrial Alcohol

Where It Is to Come From, and Some of the Things We Are to Do With It

By Harry A. Mount

From Swords to Plowshares

A Survey of the Post-War Activities of the Huge Krupp Works

Cultivated Rubber

How the "Plantation" Has Made It Possible for the Grower to Keep Pace with the Demand

By G. A. Orb


  • Departments


  • The Heavens in September, 1921

  • Inventions New and Interesting

  • Recently Patented Inventions

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