A Poor Start

Time for Another Principia

Peary and the North Pole

Opening of Extensions of the New York City Subway

The Current Supplement

Burke's Own Account of the Spontaneous Action of Radium on Gelatin Media

Official Meteorological Summary, New York, N. Y., June, 1905

Tallest Concrete Chimney Ever Constructed

The Navy Wireless School

A New Aeroplane

The Temple of Abu Simbel

Some New Automobile Track Records

Peary's Arctic Ship, the Roosevelt

The Sixth International Automobile Race for the Bennett Trophy

Improved Methods in High-Speed Chrono-Photography

The Whirlpool Illusion

An Electrically-Operated Gyroscope

A Newly-Discovered Motion

Patent Department - July 15, 1905

Oddities in Inventions

A Gas-Saving Device

Business and Personal Wants - July 15, 1905