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

Electricity

Science

Engineering

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

A Problem in Mechanics

The Commercial Possibilities of the Aeroplane

New Type of Sub-Surface Torpedo Boat

The Queensboro and Manhattan Bridges across the East River

A Life Preserver for Balloonists

Aeronautical Notes

A New Railroad Spike

Patent Department

A Novel Frying Device

A Simple Drawer Stop

An Improved Rat Trap