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Features

Government Tests of Railway Safety Devices

The Double-Flow Turbine

Improvement of New Jersey-New York Suburban Service--I

Congress Increases Patent Office Salaries

The Cost of Government

A New Balloon Material

The Current Supplement

The Autogenous Soldering of Aluminium in Aeronautic Construction

Training in the Navy

By John R. Cox

New Electrical Apparatus of the United States Signal Corps

By C. H. Claudy

The Motor-Boat Race to Bermuda

Farman's Aeroplane Flights in Belgium

Making Casts in Gelatin Molds

By W. Frank M'Clure

A German Compass-Testing Station

By The Berlin Correspondent of the Scientific American

A Remarkable Mountain Railway

By Alfred Gradenwitz

Pipe and Rod Lifting Tongs

An Aero Tube Flying Machine

An Improved Dabbing Brush

Saw Swage

Bracket Hose Reel

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June 20, 1908

Beyond XX and XY

Biology. Identity. Equality.