Volume 20, Issue 10
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Features
The Great Polish Salt Mines
Coal or Sun
Tobacco Pipes
“Waste” and “Economy” of Fuel
Tremper's Three-Wheeled Velocipede
Velocipede Notes
Transmutation of Metals
Coloring of Marble and Other Building Stones—A New Process
Trials and Triumphs of Inventors
The Darien Ship Canal—Water Communication between the Atlantic and Pacific
Horticultural Protection
Manufacture of Artillery Powder in England
Improvements in Enameling Iron Ware
Answers to Correspondents
Applications Before Congress for the Extension of Patents
Editorial Summary
Manufacturing, Mining, and Railroad Items
New Publications
Recent American and Foreign Patents
Official List of Patents
Issued by the United States Patent Office