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The Senate Hearing on the Alleged Defects of our Navy

Government Aid in the Development of Aeronautics

The Peril of the Turnstile Door

Decolorizing Power of Animal Charcoal

Scientists at Play

By Herbert W. Horwill

The Current Supplement

Lowering the Traction Tunnels Under the Chicago River

By L. F. Wilson

Japanese Battleship “Iwami” as she was and is--A Lesson in “Freeboard”

Lippmann's Method of Stereophotography without a Lens

A New Apparatus for Submarine Operations

The Manufacture of Mechanical Organs

By Jacques Boyer

Saturn's Rings

By S. A. Mitchell

Gas Engine Igniter

Patent Department

An Improved Gasoline Trap

Improved Sash Lock

Casting Tool for Printing Offices

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April 04, 1908

Help Us Reforest the Mississippi River Valley