
The SciencesSeptember 1, 1938
Diesels in the Air
Prove Their Value, For Military and Commercial Operations, In Active Use, Nearest Approach to Smooth Turbine Like Power Flow

Diesels in the Air
Prove Their Value, For Military and Commercial Operations, In Active Use, Nearest Approach to Smooth Turbine Like Power Flow

Helium—Hope of the Airship
Commercial Quantities Produced Only In United States . . . Safer, More Economical Lifting Gas than Hydrogen . . . Stringent Sales Regulations