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Submarines Betrayed by Sound Waves

Detecting the Presence of Underwater Craft Fifty-five Miles Away by Microphonic Devices

Salvage of the Submarine F-4

How the Vessel Was Recovered from a Depth of 300 Feet

By J. A. Furer

Strategic Moves of the War, October 7th, 1915

By J. B. W. Gardiner

The Largest Arch Bridge in the World

Direct Rail Connection Between New England and the South and West

Stretcher Hammock and Stretcher Chair

Invented by the Comtesse de Chaumont Quitry

By Neil Truslow

Completion of Arrowrock Dam

The Highest Dam in the World

By M. F. Cunningham

Notes for Inventors - October 16, 1915


  • Letters

    Correspondence - October 16, 1915

  • Departments

    The Motor-driven Commercial Vehicle - October 16, 1915

  • Recently Patented Inventions - October 16, 1915

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