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When Electricity Was Really in its Infancy, What Sank the "Lusitania"? and more

By Francis B. Crocker

Storing the Tourists' Needs, A New Life-boat

By Stanley Petman

The Study of Animal and Human Behavior

By L. K. Hirshberg

What the National Guard Needs, Loading and Firing Submarine Torpedoes and more

[Article on firing submarine torpedoes goes with cover image]

By W. W. Wright

A Mercury-Vapor Engine

Increasing the Efficiency of a Heat Engine by Employing a Liquid of High Boiling Point

Measuring the Twisting Strength of Steel, Model of the Typhus Carrier and more

By Robert H. Moulton

Concrete for Churches

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    Correspondence - May 29, 1915

  • The Heavens in June

  • Recently Patented Inventions - May 29, 1915

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May 29, 1915Cover Image: Loading a Torpedo into One of the Four Forward Tubes of a Submarine

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