Features
Achievements of Military Aircraft
Lessons Taught by the European Maneuvers and by the Tripolitan and Balkan Campaigns
Harnessing the Public Water Power
Progress in the Development of Our Natural Resources
Suspension Insulators Suitable for 110,000-volt Transmission
Tests Showing the Weaknesses of Standard Types
The Destruction of the German Dirigible "L. Z. 15."
Fighting the Chestnut Bark Disease
The State of Pennsylvania's Work
The Recent Storms and Floods
A Remarkable Series of Cataclysms
Notes for Inventors, Legal Notes and more
Latent Pressure in Rock Strata, The Problem of the World's Oil Supply and more
Departments
- Letters
Correspondence - April 5, 1913
- Departments
Inventions New and Interesting - April 5, 1913
Recently Patented Inventions - April 5, 1913
Notes and Queries - April 5, 1913
