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Congress and Military Aeronautics

The New York Motor Boat Show

The Lock-and-Lake Canal Approved

The High-Pressure Fire Automobile

Cuba's Debt to our Engineers




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 Practical Side of Aerial Locomotion

The Aurora Borealis and Morehouse's Comet

More Curious Facts about Numbers

Magnetism and the Aurora

Novel Life-Saving Apparatus

By our English Correspondent

Road Building by the United States in Cuba

By William Atherton Du Puy

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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  • Recently Patented Inventions

  • Index of Inventions

  • New Books, Etc.

  • Notes and Queries

  • Patents

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February 13, 1909