Features
To the Mayor of New York, Boy Scout Week and more
A Question of Identity
Were Flying Reptiles Merely Unfeathered Birds, or Birds Merely Feathered Reptiles?
Patents and Profits
Why Does an Inventor Sometimes Fail to Receive the Expected Reward?
French Naval Policy and the Lessons of the Great War
A Brief Study of the Ships of the War and Their Performances
Oddities of the Trans-Atlantic Flight
A Review of the Attempts of the C-5, Sopwith, Martynside, and NC Entries
A Shooting University
The Great Naval Rifle Range at Caldwell, New Jersey, Where the General Public Will Be Taught by Experts How to Use the Rifle
The French Problem of Reconstruction--IV
Some of the Details of Agricultural and Industrial Restablishment
Testing Physical Fitness with the Camera
The Mensurgraph a New Aid to Photographic Measuring
A Stethoscope for the Earth
The Geophone, Invented for War Service, but Which Gives Promise of Great Industrial Value
The Current Supplement
Aerial Conductors of Aluminum
Departments
- Departments
Correspondence - May 31, 1919
The Heavens in June, 1919
Inventions New and Interesting - May 31, 1919
Recently Patented Inventions - May 31, 1919
