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A Mountain of Copper, Air Pressures in Playing Wind Instruments, and more

The Plumbing of the Human Body

The Surgeon as a Sanitary Engineer

The Problem of Our Navy-April 11, 1914

VII.—Personnel—The Question of Officers and Men

Protection From X-rays in Radiography

The Devices of Dr. Maxime Ménard

By Jacques Boyer

Vocational Guidance and Efficiency

How Boys Are Started Aright in Life

By Benjamin C. Gruenberg

A Self-steering Farm Motor, Fodder Equivalents and more

By Herbert I. Washburn

Guns on Aeroplanes

By John Jay Ide

Nebuchadnezzar as a Builder

By Edgar J. Banks

Safe Moving Pictures

The Inventions of Nicholas Power

By Arthur J. Lang

Popular Beliefs and Scientific Facts, A Rockefeller Fund for the Study of Animal Disease, and more


  • Letters

    Correspondence-April 11, 1914

  • Recommended

    New Books, etc.-April 11, 1914

  • Departments

    Recently Patented Inventions-April 11, 1914

  • Notes and Queries-April 11, 1914

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Dwindling Supply. Increasing Demand.

Dwindling Supply. Increasing Demand.

Solving the Water Crisis