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Features

How Beer is Made

By Ernest Elva Weir

Germany's Submarine Effort, Clandestine Wireless Stations Here and Abroad, and more

Airmen and the Weather Bureau--Partners

The Meteorological Work Undertaken at the San Diego Army Aviation School

By C. L. Edholm

Women-Chemists in Wartime

[article on chemistry schools for women in Berlin and elsewhere]

By Alfred Gradenwitz

Strategic Moves of the War--March 29th, 1917

By Our Military Expert

The American Merchant Marine

Where it Will Stand Upon Return of Normal Times

By Robert Dollar

Gun Versus Armor

Will Long-Range, Big-Gun Attack Call for a Redistribution of Armor?

By J. Bernard Walker

Machines for Mining Coal

Reducing the Hazards of Hand Mining and Improving the Product

High Tension Submarine Cable Between Denmark and Sweden, Are Wooden Shoes Coming into Vogue Again?

The Car of All Work

By C. L. Edholm

Salving a Big Ship

How the "Republic" was Floated by Building Up her Sides

What I Can do for My Country

I. The Chemist

A New French Artificial Eye

[article about a facial prosthetic developed by the French]

Aluminum Coated Iron Castings, Nothing New Under the Sun, and more

National Forest Enlarged, The Most Active Classes of Inventions, and more

Why the Average American Dies at Forty-three

By R. W. Lockwood

Departments

  • Recommended

    New Books, Etc.- April 7, 1917

  • Departments

    The Heavens in April, 1917

  • Inventions New and Interesting- April 7, 1917

  • Recently Patented Inventions- April 7, 1917

  • Notes and Queries- April 7, 1917

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April 07, 1917Oil-tempering the inner tube of a 16-inch gun (see page 346)

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