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Airplane Passenger Service of Today, How Insects Lower Milk Yield, and more

Repairing the Stern-Frame of the "Northern Pacific"

The Largest Marine Weld Ever Made

The Aberdeen Chronograph

An Improved Device for Timing the Flight of a Projectile, Developed by the Army Ordnance Department

By Herbert T. Wade

Economic Tree Murder

How We Are Denuding Our Forests to Supply Europe While She is Conserving her Own Timber

By C. H. Claudy

The Failing Dollar

How Shall We Arrest the Decline of its Purchasing Power?

By Alfred J. Lotka

Our Technical Achievement in the Great War--II

Training a Citizen Army of 2,000,000 Men Intensively in Nine Months' Time

Some Interesting Color Phenomena

By M. Luckiesh

A Revolving Apartment

Making One Room Take the Place of a Whole Suite

Two Far-Reaching American Flights, Commonwealth Drydock at Boston—Largest of Its Type and more

Chemical Cleaning with Glycol, Latest Patent Decisions and more


  • Departments

    Correspondence - August 9, 1919

  • The Heavens in August 1919

  • Inventions New and Interesting - August 9, 1919

  • Recently Patented Inventions - August 9, 1919

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