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Sea-level Canal Fallacies, Japan's Battle-cruiser Squadron and more

An Integrating Opacimeter for Stellar Photography

By Jacques Boyer

Cathode Rays from Incandescent Lamps, New Kerosene Vaporizer Demonstrated and more

By Our Berlin Correspondent

The Prototype of the Yale Lock

By Walter Schumann

Comparison of French and German Strength in Dirigible Airships

Why Germany is the Leading Air Power

The Japanese Battle-cruiser "Kongo"

The Most Powerful Armored Cruiser Afloat

John Milne, The Death of S. F. Cody, and more


  • Letters

    Correspondence - August 16, 1913

  • Departments

    Inventions New and Interesting

  • Recently Patented Inventions - August 16, 1913

  • Notes and Queries - August 16, 1913

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