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Features

The Great Polish Salt Mines

Improvement in Machine for Making Paper Pulp, Driving Reins for Horses

Tobacco Pipes

Coal or Sun

“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

Horticultural Protection

Trials and Triumphs of Inventors

The Darien Ship Canal—Water Communication between the Atlantic and Pacific

Manufacture of Artillery Powder in England

Improvements in Enameling Iron Ware

Answers to Correspondents

Editorial Summary

Applications Before Congress for the Extension of Patents

Manufacturing, Mining, and Railroad Items

New Publications

Recent American and Foreign Patents

Official List of Patents

Issued by the United States Patent Office

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