Features
The Disaster to One of Our Latest Submarines
How an Air Valve, Inadvertently Left Open, Caused S-5 to Plunge to the Bottom
Bomb-proof Coal Mining
Timing the Hundred-Mile-Per-Hour Racer
The Oil-Field Geologist
How Science Has Made Gambling on Petroleum Prospects a Thing of the Past
The Toolmaker's Tools
The Modern Art of Grinding, and How the Wheels That It Uses are Made
Solving the Labor Problem--I
The Development of an Industrial Policy of Mutual Interest Between Employer and Employee
Reconstructing Stonehenge
Work of Preservation That May Solve the Origin of Britain's Most Mysterious Ruin
To Make Hens' Eggs Hard, "Flu" Experiments on Monkeys
Departments
- Departments
Inventions New and Interesting - September 25, 1920
Recently Patented Inventions - September 25, 1920
New Books, Etc. - September 25, 1920