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Launching an Airplane from an Airship, Dynamiting Devastated Orchards in France and more

How Uncle Sam Has Created an Army of Athletes

Training Camp Activities Which Worked Wonders in Permanent Physical Betterment of the Drafted Men

The Principles of Camouflage--II

Low Visibility and Optical Illusion on the Sea

By M. Luckiesh

Worlds of Four Dimensions

A Field of Mathematics Equally Interesting to Student and Layman

The Instability of American Airplanes

Sources of the Defects That Have Killed Many Pilots Revealed by Experiments that Reduce Aerodynamics to the Elementals

By W. H. Ballou

Mechanical Equipment of the Farm

Latest developments in agricultural machinery and practical suggestions for the farmer

By Harry C. Ramsower

Battleship Guns on the Western Front

How the Navy Placed Five 14-inch, 30-Mile Range, Guns on the Battle Line in France

By C. L. McCrea

World Markets for American Manufactures

By Lynn W. Meekins


  • Departments

    Correspondence - February 8, 1919

  • Inventions New and Interesting - February 8, 1919

  • New Books, Etc. - February 8, 1919

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