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Scientific American
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Scientific American Magazine
May 1869
Volume 20
,
Issue 20
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Features
How Engineering Difficulties are Overcome
Improvement in Machine for Thrashing and Winnowing
What is a Flux?
Explosive Compounds for Engineering Purposes
Beet Root Sugar
Wood Engraving—Ancient Process
A Reformation in the Patent Office
Eating Considered as Not a Fine Art
The Sale of Gas by Quality as Well as Quantity
Earth Closets
Velocipede Notes
The Colors of Plants and Flowers
Editorial Summary
Manufacturing, Mining, and Railroad Items
Answers to Correspondents
New Publications
Applications for the Extension of Patents
Recent American and Foreign Patents
Official List of Patents
Departments
Correspondence
Business and Personal
