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Features

Battery-Operated Locomotive Headlights

Various forms of the Periscope

Principles and Development of a Valuable Instrument used in War

Ozone Sterilizing Plant

The Romance of Motion Pictures

A Scientific Toy that has Grown to be a Great Commercial Factor

By C. Francis Jenkins

The Measurement of Distances in War

Ingenious Modern Methods and Instruments Now Used

Fuel Oil

Harvest Forecasts for 1915

Atoms and Ions—IV

A Comprehensive Discussion Especially as Related to Gases

By J. J. Thomson

How much Albumen is needed in our Diet?

Interesting Results of Some Extended Experiments

Measurements of Radium

European Aeronautical Laboratories—I

Their Organization, Equipment and Methods of Investigation

By A. F. Zahm

A Vibration Electrometer

Removing Tar from Gas

The Coolidge Tube in Metallurgical Research

By P. Davey

The Telephotographic Apparatus of Georges Rignoux

Experiments in Sending Visible Forms Electricity

By R. Arapu

Wire-Winding Big Guns for Uncle Sam

Methods by Which the Most Powerful Guns in the World are Made

By Chester L. Lucas

Cultivation of Living Tissues outside the Body

Rifling Canon

Keeping Steam Turbine Blades Clean

Pathology of Mental Diseases—II

Modern Aspects of Certain Problems

By Edwin Goodall

The Dyestuff Industry

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May 22, 1915

Think Outside the Gift Box