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His Holiness Pope Leo XIII

American Railway Equipment

Self-Igniting Devices for Coal-Gas

Marine Engines

Kerosene Vs. Gasoline

By A. E. Potter

Machine for Carving Wood Moldings

Aberration of the Sphericity of the Eye

Vanadium Steel

The World's Coal Production

The Simplex Spraying Nozzle and Water Cooling System

Industrial Application of the Diastases: The most Recent Discoveries

Some Details of the Paris-Madrid Racing Automobiles

Specially Prepared for the Scientific American Supplement by our Paris Correspondent

Direct Production of X-Rays in the Air

Trade Suggestions from United States Consuls

Electrical Notes

Trade Notes and Recipes

Engineering Notes

A Simple Circular Computing Scale

By James Alex Smith

The Submarine Boats “Pike” and “Grampus”

Electric Sodium Manufacture in Germany

Hertzian Wave Telegraphy

Dr. Fleming's Third Paper

In the Heart of Thibet

The Origin of the Diamond

By E. M. Souvielle

Investigations in Phonograph Phenomena


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    July 18, 1903

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