Volume 21, Issue 22
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Features
Ammoniacal Gas-Engines
Captain Ericsson on the Rotation of the Earth
Potash from a New Source—The Stassfurt Mines
A Useful Brazing Lamp
Malleability and Ductility of Metals
The Canal of Suez and the Future of Egypt
H. W. Staple's Automatic Lamp Filler
A Simple Filter
Mechanical Accuracy
Death Of Inventors
What will you do with your Evenings this Winter?
A Huge Joke in Brass
Electro-Plating with Iron
Aerial Navigation
U.S. Patent Office
Recent American and Foreign Patents
Manufacturing, Mining and Railroad Items
Official List of Patents
Issued by the United States Patent Office