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Kammerlingh Onnes, the Dutch Specialist in Cold, Problem of the Slides at Culebra and more

Hydraulic Fill Dam for an Earthquake Region

Work on the Calaveras Reservoir of the San Francisco Water Supply

Using a Store Entrance for Night Displays

Elevator Show Windows That are Dressed in the Basement

Military Air Scouting by Motion Pictures, Steel Darts, and more

Germany has apparently used motion pictures to scout enemy positions.

By Ernest A. Dench

Doing Without Europe--III

How the War Has Affected Our Mineral and Metal Industries and How We May Profit

The United States an Undefended Treasure Land - Part II

We Are Short of Arms and Ammunition for Regulars and Militia, and Have Absolutely None for Such Volunteers as Would Have to be Raised in the Event of Invasion

Heat from Our Lady of the Snow

Coal-Mining in the Arctic Circle

By H. J. Shepstone

Watching Distant Machines from a Desk, The Envelop Sealer of the Pension Office and more

By Herbert T. Wade


  • Departments

    Inventions New and Interesting - February 13, 1915

  • Recently Patented Inventions - February 13, 1915

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