Volume 121, Issue 5
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Features
Helium or Hydrogen, The First Dreadnought Design and more
The Tenth Anniversary of the World's Military Aviation
Looking Back at 1909 When our War Department Secured the First War Airplane and Enthusiasm was Worldwide
Fabricated Lumber and the Housing Problem
Who shall do the Work?
A Study of the Present Situation with Regard to Common Labor
Burning the Profits
A Problem Confronting the Lumber Industry of the Pacific Coast
Our Technical Achievements in the Great War--I
Making Four Million Soldiers of Four Million Citizens
A Tornado that Tied itself in a Knot
A Remarkable Loop Formation Luckily Recorded by the Camera