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The Park Place Subway Station Escalators

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?

By W. H. Ballou

Patents and Profits

Why Does an Inventor Sometimes Fail to Receive the Expected Reward?

By Dudley T. Fisher

French Naval Policy and the Lessons of the Great War

A Brief Study of the Ships of the War and Their Performances

By Robert W. Neeser

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

By Edward C. Crossman

The French Problem of Reconstruction--IV

Some of the Details of Agricultural and Industrial Restablishment

By C. H. Claudy

Testing Physical Fitness with the Camera

The Mensurgraph a New Aid to Photographic Measuring

By Robert G. Skerrett

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

    Correspondence - May 31, 1919

  • The Heavens in June, 1919

  • Inventions New and Interesting - May 31, 1919

  • Recently Patented Inventions - May 31, 1919

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