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Features

The Cherry Mine Disaster

High and Cross-Country Flying Abroad

A Decision Under the German-American Patent Treaty

Science

Engineering

Electricity

Some Photographic Diversions

By Gustave Michaud

Safeguarding Mines

How Does Sap Run in Pine Trees?

An Early Marine Engine

A Novel Aerial Railway

How to Observe and Record the Weather

By Thaleon Blake

Testing the Man-Engine

By John Elfreth Watkins

Spray Helmet for Firemen

Curiosities in Science and Invention

Coin-Operated Device for Registering Letters

An Early Type of Submarine Boat

The Ice Drag of the Wellman Expedition

The Great Stone Globe at Swanage

An Emergency Oxygen Cup for Miners

By Frederic B. Hyde

Indoor Bed Tents

By Katherine Louise Smith

Departments

  • Departments

    Correspondence

  • The Heavens in December

  • Recently Patented Inventions

  • Notes and Queries

  • Patents

  • Index of Inventions

  • New Books, Etc.

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December 04, 1909

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