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An Economical Coal-Handling Plant

The Construction of Simple Electroscopes for Experiments on Radioactivity

A Variable-Speed Gear

Giving All Speeds From Zero to a Maximum

The Chemistry of Patinas

By O. N. Witt

A Novel Thermo-Electric Battery

By Emile Guarini

A New Secret Service Telephone

By the English Correspondent of SCIENTIFIC AMERICAN

Quantity of Cotton Ginned in the United States

Armor-Plate Tests for the Latest Japanese Battleship

By Our English Correspondent

Stellar Brightness and Density

By J. E. Gore

Study of Lunar Photographs

By the Paris Correspondent of the Scientific American

Musical Instruments: Their Construction and Capabilities.—III

By A. J. Hipkins

Fishing in the Philippines

Oscillations of Shore Lines

Curious Insects of the Amazon

Our Sun and “Weather”

By William J. S. Lockyer

Atmospheric Pressure and Chronometry

From the French of Dr. Ch. Ed Guillaume, Associate Director of the Bureau of Weights and Measures, in La Nature

Electrical Notes

Engineering Notes

Trade Notes and Recipes


Selected Formulæ


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