Features
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
A Novel Thermo-Electric Battery
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
Study of Lunar Photographs
By the Paris Correspondent of the Scientific American
Musical Instruments: Their Construction and Capabilities.—III
Fishing in the Philippines
Oscillations of Shore Lines
Curious Insects of the Amazon
Our Sun and “Weather”
Atmospheric Pressure and Chronometry
From the French of Dr. Ch. Ed Guillaume, Associate Director of the Bureau of Weights and Measures, in La Nature
