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Features

Congress and Military Aeronautics

The High-Pressure Fire Automobile

The Lock-and-Lake Canal Approved

Cuba's Debt to our Engineers

The New York Motor Boat Show

Electricity

Engineering

Science

Projecting Moving Pictures in the Light

By Jacques Boyer

An Egyptian Steam Cultivator

By our Correspondent in Paris

The Opposition of Mars in 1909

By Frederic R. Honey

Comparison of Wright and Voisin Aeroplanes

The Aurora Borealis and Morehouse's Comet

Magnetism and the Aurora

More Curious Facts about Numbers

The Practical Side of Aerial Locomotion

Road Building by the United States in Cuba

By William Atherton Du Puy

Novel Life-Saving Apparatus

By our English Correspondent

Photographing Animals under Water

By Jacob Reighard

A New Direct-Reading Photometer

A $250 Prize for a Wet-Grain Conveying System

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February 13, 1909

Complex Causes. Alternative Solutions.