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Dutch Cooling Towers of Concrete, New Plant Foods and more

Building in the Wilderness

Where the Engineer Has to Lay Down a Railroad to Take Him to His Job

By A. R. Surface

The Third Degree for the Baseball

By Edgar Lockhart

Handling High Voltage with Bare Hands

By George Gaulois

Muggy Days and Thirsty Air

The Mechanism That Keeps Us Cool, and Why It Fails to Work in Damp Weather

By Alexander McAdie

Radium and its Works

How the Alpha, Beta and Gamma Rays Are Being Applied in Commerce and in Medicine

By Ralph Howard

Where Willow Ware Comes From

How the Tree Is Grown and Tended to Yield the Raw Materials of Furniture and Basket Factories

By George H. Dacy

A Forward Step in American Airplane Engines, This Year's Nominations for the Hall of Fame

By Col. Jesse G. Vincent

Smothering Fire with Bubbles of Gas

How Carbon Dioxide Protects the Oil Tank Against Its Greatest Hazard

By J. F. Springer

Is the Dam Safe?


  • Departments

    Correspondence - September 4, 1920

  • The Heavens in September, 1920

  • Inventions New and Interesting - September 4, 1920

  • Recently Patented Inventions - September 4, 1920

  • Notes and Queries - September 4, 1920

  • New Books, Etc. - September 4, 1920

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