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Hadrian's Villa at Tivoli

Thumb Ring Lore

How did the Romans Heat their Living Rooms and Baths?

The Moros and their Country

By Stephen Bonsal

A Review of the Existing Methods of Cultivating Anaerobic Bacteria

Absorption of atmospheric oxygen

By Otto F. Hunziker

The Biological Reaction of Blood

History of Cold and the Absolute Zero

By James Dewar

Royal Danish Porcelain

Punta Arenas: The Most Southerly Town on the Globe

By Ernest C. Rost

Some Animals at the Zoological Gardens in Berlin

By L. Heck

The Testing of Cement

A New Definition of Portland Cement

By A. D. Elbers

Chamois Skins

By Herbert T. Blake

Compound Locomotives are Twenty-Five Years Old

Electrically-Operated Air Compressors

The World's Telegraphs

German Electrical Manufacturers

Comparative Acceleration Tests with Steam Locomotive and Electric Motor Cars

By B. J. Arnold and W. B. Potter

Trade Suggestions from United States Consuls

Selected Formulæ


  • Departments

    Patents - October 4, 1902

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