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Features

Dressing Millstones by the use of the Diamond

Captain Ericsson on the Rotation of the Earth

Ammoniacal Gas-Engines

By F. A. P. Barnard

Potash from a New Source—The Stassfurt Mines

A Useful Brazing Lamp

Malleability and Ductility of Metals

By John Anderson

The Canal of Suez and the Future of Egypt

H. W. Staple's Automatic Lamp Filler

A Simple Filter

What will you do with your Evenings this Winter?

Death Of Inventors

Mechanical Accuracy

A Huge Joke in Brass

Aerial Navigation

Electro-Plating with Iron

U.S. Patent Office

Manufacturing, Mining and Railroad Items

Recent American and Foreign Patents

Official List of Patents

Issued by the United States Patent Office

Departments

  • From the Editor

    Our Work and Its Results

  • Answers to Correspondents

  • Letters

    Correspondence - November 27, 1869

  • Recommended

    New Publications

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    Business and Personal

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November 27, 1869

Beyond XX and XY

Biology. Identity. Equality.