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How it is Done and What it is For

By William Bowie

Our Changing Transportation

By Charles Dillon

Zone Television and the Television Arc

By Sydney A. Moseley

Tidying Up the Constellations

By Henry Norris Russell,

Problems of Calendar Improvement

By George Eastman

Tons of Human Hair in Industry

By Grace Lockhart

This New Big Business of Gardening

By Archer P. Whallon

From the Archeologist's Notebook

Man's Insect Allies

By G. Lightfoot and G. Rawson

Change—The Great Competitor

The Autogiro, the result of a new idea, has invaded the transport plane's field and is now in use by several firms

By Raymond Willoughby


By W. L. Whitehead

Clemenceau and Foch

The United States Enters the War: The Armistice: The Peace Conference

By W. D. Puleston

Diesel Versus Gasoline-Engined Plane

A Flexible Amusement Building

A Two-Mile Industrial Water Tunnel


  • Departments

    Across the Editor's Desk, June 1931

  • Back of Frontispiece, June 1931

  • Modern Methods in the Fortress City of Palestine

  • Our Point of View, June 1931

  • What We Eat, a Shallow-V-Bottom Boat and more

  • "Finesse" Allowed 3S Soap Mark, Dry Ice Suit Lost and more

  • Index To Volume 144, January-June, 1931

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