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Center Versus Side Door Cars

The Renaissance of the Spanish Navy

The New Hudson River Steamer Robert Fulton

The Fourth Dimension Essays

Recent Flights of Germany's First Zeppelin Military Airship




A Life-Line Air Cannon

By the English Correspondent of the Scientific American

The Filtration of City Water Supply

Detecting Underground Streams with an Ear-Trumpet

By the Paris Correspondent of the Scientific American

Pythons and Their Prey

By W. Henry Sheak

A Problem in Mechanics

The Commercial Possibilities of the Aeroplane

Stereoscopic Illusion

New Type of Sub-Surface Torpedo Boat

The Queensboro and Manhattan Bridges across the East River

A Life Preserver for Balloonists

By Alfred Gradenwitz

Aeronautical Notes

A New Railroad Spike

Patent Department

A Novel Frying Device

A Simple Drawer Stop

An Improved Rat Trap


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  • Index of Inventions

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  • Recently Patented Inventions

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April 10, 1909

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