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The Development of Submarine Boats—II

From Bushnell to Holland and Lake

By Simon Lake

Vanadium—Its Discovery and History

Found in a Brown Lead Ore from Zimapan, Mexico

Experimental Science Teachinǵ

Some Applications of Mariotte's Bottle

Maǵnetic Crystals

An Interesting Investigation into the Magnetic Properties of Crystals

By Victor Quittner

The Arǵon Process

The “Holy Mountain”

Exploring in the Sinai Peninsula

By Harold J. Shepstone

The Kniǵht Valveless Motor

A Highly Efficient Hydrocarbon Engine

The Geoloǵical Society of America

Report of the Annual Meeting at Pittsburgh, Penn

By E. O. Hovey

The Light of the Sky

Index of Inventions

Aeronautical Notes


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