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The German Industrial Exposition at Duesseldorf

By Frank C. Perkins

The Cape to Cairo Railway

A Contractor's appliance

A New Safety Signal System for Repeating Railway Danger Signals Visibly and Audibly in the Locomotive Cab

Electric Coal Cutter

Electric Waves and their Effect on the Human Brain

How to make a Dry Battery

By William A. Del Mar

History of the Invention of Incandescent Gas-Lighting

By Auer Von Welsbach

Automobilism in Prussia

I.—the motor-carriage exposition at berlin

Medical Literature

Sisal Hemp Culture in Yucatan

By Charles Richards Dodge

Problems in the Chemistry and Toxicology of Plant Substances

Egyptians' Eye for Nature

Radio-Activity of Thorium Compounds

Preparation of new Electrolytes, with Base of Carbonates Dissolved in Organic acids, and Chlorides, or Organic Acids and Alkalies

Printing Stereoscopic Positives upon Glass without Transposition

Why is New Bread Indigestible?

Bird Migration and Bird Song

The Electrolytic Production of Chlorates

By John B. C. Kershaw

Trade Suggestions from United States Consuls


  • Departments

    Patents - August 2, 1902

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