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The New Telephone Exchange of Berlin

By Emile Guarini

Present Methods of Dyeing

Contemporary Electrical Science


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

Contributions to our Knowledge of Radium

By W. Marckwald

Theory of Radio-Active Phenomena

Lord Kelvin on Waves

How the N-Rays may be Obtained


Electrical Notes

Trade Notes and Recipes

Trade Suggestions from United States Consuls


Selected Formula


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    April 23, 1904