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Features

The New Telephone Exchange of Berlin

By Emile Guarini

Present Methods of Dyeing

Contemporary Electrical Science

Correspondence

The Flight of Birds and the Art of Flying

The Development of the Electric Mining Locomotive.—I

By Frank C. Perkins

The Hospitalier Ondograph

By the Paris Correspondent of the Scientific American

Some Data on the Cost of Operating Automobiles for Commercial Purposes

By Hiram Percy Maxim

Korean House's

The Recent Volcanoes of Southwestern Idaho and Southeastern Oregon

Jordan Craters

By Israel C. Russell

How the N-Rays may be Obtained

Theory of Radio-Active Phenomena

Lord Kelvin on Waves

Contributions to our Knowledge of Radium

By W. Marckwald

Radium.—III

Trade Notes and Recipes

Electrical Notes

Trade Suggestions from United States Consuls

Selected Formula

Patents!

Departments

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    April 23, 1904

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