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The Defenses of Constantinople

Ample Preparations That Have Been Made by Turkey to Resist Invasion

By H. Charles Woods

Necessity for Mine Operators to Know the Ash Values of their Coal

Volatile Matter, Fixed Carbon and Sulphur in Coal

A New Type of Aeroplane

An “Even Keel” Flyer Embodying Many Original Features

By Thomas A. Edison Lake

German War-Driven Scientific Progress

Tetanus Serum for the French Army

Photo-Electricity—I

The Intimate Relations of Light and Electricity

By J. A. Fleming

Kilns for Lime Burning

Problems of Geographical Influence

Physiological and Psychical Influences That Are Affected by Environment

Italy and Engineering

Sugar Beet Cultivation in England

Machining Shrapnel Shells

Many Accurate Operations Necessary to Produce a Perfect Projectile

By Douglas T. Hamilton

Labor Statistics of Coal Mining

The Manufacture of Condensed Milk, Casein, Etc.—I

Discussion of Methods of Analyses

By R. T. Mohan

Principles of Coal Sampling

How Daily Records Save Coal

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    July 03, 1915

    Think Outside the Gift Box