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Precious Stones in 1904

By George F. Kunz

The Coal Resources of Japan

Granite Quarries

Analogies between Light and Electric Waves.—Braun's Experiments

Gold Molecules in the Solid State

By G. T. Beilby

A New Gas Burner

A New Railway Bumping Post

Early Ethnology

Benjamin Franklin, the First American Heating and Ventilating Engineer

The Safeguarding of Life in Theaters

American Shipbuilding

Simple Photographic and Photo-Micro-Graphic Apparatus

Degreasing Wool

Problem of a Broken Axle

A Modern Testing Plant for Gasoline Automobile Motors

By Alfred Gradenwitz

Specifications of Material used in High-Speed Automobile and Motor-Boat Engines

By Thomas J. Fay

Steel for Reinforced Concrete

By A. L. Johnson

Electrical Conductivity and Reflecting Power of Carbon

Contemporary Electrical Science

Transmission of Electrical Energy from Sweden to Denmark

Venomous Animals

Wood Distillation

Food in its Relation to Teeth, their Sockets and Adjacent Structures

By A. W. Harlan

Electrical Notes

Engineering Notes

Science Notes

Trade Notes and Formulæ


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