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Features

How the Slides Develop at Panama, Shall we Take a Cold Bath to Cool Off After Exercising and more

Includes and editorial by a German on the permanent fortifications in Belgium

The Wrecking of the Cruiser Emden by Shell Fire

Aerial Range-Finding with Electrical "Ears"

A Microphone System of Detecting Invisible Airships and Determining Ranges

Strategic Moves of the War, October 21st, 1915

By J. B. W. Gardiner

The Great Gas Tunnel Under the East River

A Battle with Floods Two Hundred Feet Below Sea Level

By J. F. Springer

Tennis as Compared to Golf

By Dwight Douglass

Apparatus for Determining Quality and Intensity of Violin Tones

By Dorsey Richardson

Departments

  • Letters

    Correspondence - October 30, 1915

  • Recommended

    New Books, Etc. - October 30, 1915

  • Departments

    The Heavens in November, 1915

  • Inventions New and Interesting - October 30, 1915

  • Recently Patented Inventions - October 30, 1915

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October 30, 1915Cover Image: Detecting the approach of an enemy aircraft with a French "poste d'écoute" (listening post). (Article on page 377.)

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