Various forms of the Periscope

Principles and Development of a Valuable Instrument used in War

Battery-Operated Locomotive Headlights

Ozone Sterilizing Plant

The Romance of Motion Pictures

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

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

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

A Vibration Electrometer

Removing Tar from Gas

The Telephotographic Apparatus of Georges Rignoux

Experiments in Sending Visible Forms Electricity

The Coolidge Tube in Metallurgical Research

Wire-Winding Big Guns for Uncle Sam

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

Rifling Canon

Keeping Steam Turbine Blades Clean

Cultivation of Living Tissues outside the Body

Pathology of Mental Diseases—II

Modern Aspects of Certain Problems

The Dyestuff Industry