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Features

Improved Magneto-Electric Battery

Notes on Military and Naval Affairs

Magnetic Electricity

The Geological History of North America

By Stevens

Chemistry of Iron

Testing Boiler Water Gages

Hardening and Tempering Tools and Metals

Embossing Designs on Metals

Manufacture of Steel

England and the United States

Interesting Facts About Electroplating

Fifteen Thousand Patents Secured Through our Agency

Influence of Inventors Upon Their Age

Melodeons--Harmoniums

The Coast Survey and the Government

Information Useful to Patentees

To Our Editorial Brethren

Recent American Inventions

Patent Claims

Issued from the United States Patent Office

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December 07, 1861