Features
Our Deepest Wells
Some of the Scientific and Practical Problems Which They May Help Us To Solve
What About Our Commercial Aviation?
Gaging Screw Threads with a Beam of Light
The Fruits of Scientific Farming
Proofs of the Pudding Which the Department of Agriculture Has Been Cooking These Many Years
Motor Bus vs. Street Car
Some of the Reasons Why the Truck Is Doing So Well in This Competition
Mansions of Mud
How California is Meeting the Housing Problem by Building in Adobe
Battling with Snow and Ice in the Streets of New York
Again the Steam Automobile
The Latest Effort to Produce a Steam Car with All the Advantages of Gas and of Steam
Melting Brass Electrically, The Artificial Daylight of Photoplay Land
Steel and Stone Cannot Stop Them
The Amazing Ravages of the White Ant, Which Extend Even Into Temperate Regions
Better Light for Microscopy
Conquering the Stubborn Soil
Firing Shell into a Concrete Tank
The Experimental Water Butt at the Aberdeen Proving Ground of the United States Army
Electron Tube Generator
Departments
- Departments
Correspondence - February 28, 1920
Inventions New and Interesting - February 28, 1920
Recently Patented Inventions - February 28, 1920
