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Addressing Thousands Without Raising the Voice, Commercial Airplane Development and more

By Ralph Howard

Wireless Half Way 'Round the World

The Most Powerful Radio Station, Built at Bordeaux by the United States and Sold to France

By John W. Kean

Turning the Wheels of a Century Hence--I

What We May Expect to Do, and What We May Not, When the Fuel Is Exhausted

By C. H. Claudy

The Silent Teacher

How and Why the Motion Picture Is a Great Force in Explaining Technical Things

By Jerome Lachenbruch

San Francisco Goes to the Mountains

Some Details of the Lake Eleanor Dam, Part of a Comprehensive Water-Supply Scheme

By J. F. Springer

Measuring Deflection with Interference Bands

By H. L. Van Keuren

An Electrode that Bakes Itself

By A. R. Surface


  • Departments

    Correspondence - June 26, 1920

  • The Heavens in July, 1920

  • Inventions New and Interesting - June 26, 1920

  • Recently Patented Inventions - June 26, 1920

  • Index - June 26, 1920

  • Notes and Queries - June 26, 1920

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