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Recent Flights of Germany's First Zeppelin Military Airship

The Fourth Dimension Essays

The New Hudson River Steamer Robert Fulton

Center Versus Side Door Cars

The Renaissance of the Spanish Navy

Electricity

Engineering

Science

The Filtration of City Water Supply

A Life-Line Air Cannon

By the English Correspondent of the Scientific American

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 Simple Drawer Stop

An Improved Rat Trap

A New Railroad Spike

A Novel Frying Device

Patent Department

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April 10, 1909

Confronting Common Wisdom