The Future of Navies
Powers Build Larger Battleships: Sizes, Armament, Armor, Use, Effectiveness
How Metals Relax
Research Engineers Demonstrate that Metals Stretch and Lose Their Grip with Time and High Temperature
Controlling the 'Heat'
Relativity--20 Years After
Railroading's Latest Chapter
Sulfanilamide And Sulfapyridine
Now that Enough Time has Elapsed to Permit Calm Estimate of These Newly Developed Drugs, How and Where do They Stand in the World of Medicine ?
Color on a Huge Screen
What Keeps the Stars Shining?
For the Source of Stellar Energy We Must Look To Reactions Between Charged Atomic Nuclei, Discussions and Background for Bethe's Theory
They Never Say 'No'
"Prop Men" Furnish the Thousands of Odd Items That Make Motion Pictures More Realistic
50 Years Ago, June 1939
- From the Editor
Our Point of View, June 1939
Books Selected by the Editors, June 1939
Food in a Balloon, Pilot Valve, and more
Camera Angles, June 1939
Camera Angles Round Table, June 1939
Telescoptics, June 1939
Current Bulletin Briefs, June 1939
Legal High-Lights, June 1939
Index To Volume 160, January-June, 1939