Volume 20, Issue 17
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Features
Improvement in Hot-Air Engines
How Golden Hair is Obtained
Practical Suggestions on Tanning Leather
The Advantages of Quick-Liming
Explosive Compounds for Engineering Purposes
Ambergris
International Trial of Reaping Machines
Farmer's Hand Dumping Barrow
Beet Root Sugar
Gravitation the Origin of the Heat of the Sun
Shafting, Pulleys, and Belts
Cultivation of the Poppy and Manufacture of Opium
The Heating of Buildings
Persons Unfitted for the Commissionership
The Patent Office Before Congress Again
The Pacific Railway Imbroglio
An Important Office to Fill
Protoplasm
Skinning and Stuffing Birds
Why Don't Boys Learn Trades?—Mechanical Labor
Springs, Their Power and Uses
New Publications
Editorial Summary
Velocipede Notes
Velocipede Patents
Recent American and Foreign Patents
Manufacturing, Mining, and Railroad Items
Official List of Patents
Issued by the United States Patent Office