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Unique Equipment for the Unwateringg of New York City's Great Aqueduct, The Problem of Mexico and more

By Robert G. Skerrett

Automobile Dental Shop of the French Army, A Detachable Headlight Dimmer of Novel Design and more

By Jacques Boyer

Strategic Moves of the War, April 21st, 1916

By Our Military Expert

Mexico: Its Political Situation, Its Resources and its Military Strength

War Game— VII

The Decisive Attack, Enveloping Both Flanks of the Enemy

By Guido von Horvath

The New Triangulation Signal Lamp of the U. S. Coast and Geodetic Survey, A House Built with Fifty-Six Varieties of Cement

By E. G. Fischer


  • Letters

    Correspondence - April 29, 1916

  • Recommended

    New Books, Etc. - April 29, 1916

  • Departments

    The Heavens in May, 1916

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