Volume 122, Issue 13
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Features
The Panama Canal Today
The Construction and Operation of the Great Waterway Between the Atlantic and the Pacific
Wrecking Reinforced Concrete Structures--The Demolishing Art at its Best, Fighting Crickets with Flame Throwers
A Man-Sized Helicopter that Leaves the Ground with Full Load
The Romance of Invention--X
The Father of the Lubrication of the Future
Testing Airplane Propellers
The Establishment at McCook Field Where the Aviation Service Does This on a Large Scale
Why the Trailer has Made Good
Some Points Connected with Its History and Its Current Use with Motor Trucks and Tractors
The Latest Word in Steel
How Molybdenum Has Gained a Place Among the Foremost of Alloying Agents