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Features

Production of Beauty in Art

Improvement in Tweer Irons for Forges, Adjustable Lathe Tool Post

Manufacture of Paraffine

The Topliff and Ely Adjustable Velocipede

“Waste” and “Economy” of Fuel

Aluminum

By C. A. Joy

Exlposive Compounds for Engineering Purposes

Geisler's Patent Baby Walker

Panama Hats—What They are Made From, and How

Is a Flying Machine a Mechanical Possibility?

The Patent Office

Applications of the Giffard Injector

Why is Mechanical Labor Objectionable?

Velocipede Notes

Art of Coloring Marble

About Earthquakes

Editorial Summary

Manufacturing, Mining, and Railroad Items

Recent American and Foreign Patents

Answers to Correspondents

New Publications

Official List of Patents

Issued by the United States Patent Office

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March 13, 1869

Beyond XX and XY

Biology. Identity. Equality.