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
The Craters of the Moon
The Trade-Mark Liberty Registered by the United States
Rare Metal from Pyrites Flue Dust, A New Process for the Manufacture and Purification of Peroxide and more
Departments
- Departments
Correspondence - August 2, 1919
Inventions New and Interesting - August 2, 1919
Recently Patented Inventions
New Books, Etc. - August 2, 1919
