Volume 120, Issue 6
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Features
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
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
Mechanical Equipment of the Farm
Latest developments in agricultural machinery and practical suggestions for the farmer
Battleship Guns on the Western Front
How the Navy Placed Five 14-inch, 30-Mile Range, Guns on the Battle Line in France