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Features

Wanted--A Reliable Aeroplane Motor

A Sensible “Civil Calendar”

Keeping Milk by Chilling It

Medievalism in Modern Chemistry

Aeronautics

Electricity

Engineering

Asking the Tree to Speak

By Charles E. Cooke

Some Acoustic Experiments

By Gustave Michaud

Marvelous Paintings of Nature

By Alfred Gradenwitz

Halley's Comet

By Alexander W. Roberts

Bleriot's Channel Flight and other Records in France

Completion of the Government Contract by Orville Wright at Fort Myer

The Wiesen Viaduct

An American Forestry School

By Day Allen Willey

An Electromagnetic Drill

Handy Man's Workshop

Thawing Dynamite

Saw-Filing Clamp

By C. A. Pitkin

An Electrolytic Rectifier for Charging Ignition Batteries

By Frederick E. Ward

To Support Shaft When Babbitting

By J. Edwin Kerr

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August 14, 1909

Complex Causes. Alternative Solutions.