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Scientific American Magazine Vol 101 Issue 23

Scientific American Magazine

Volume 101, Issue 23

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Features

High and Cross-Country Flying Abroad

The Cherry Mine Disaster

A Decision Under the German-American Patent Treaty

Science

Electricity

Engineering

Some Photographic Diversions

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

Thaleon Blake

Testing the Man-Engine

John Elfreth Watkins

Coin-Operated Device for Registering Letters

The Ice Drag of the Wellman Expedition

An Early Type of Submarine Boat

The Great Stone Globe at Swanage

Curiosities in Science and Invention

Spray Helmet for Firemen

An Emergency Oxygen Cup for Miners

Frederic B. Hyde

Indoor Bed Tents

Katherine Louise Smith

Departments

Correspondence

The Heavens in December

Recently Patented Inventions

Notes and Queries

Index of Inventions

New Books, Etc.

Patents