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Electro-Deposition of Iron

Patent Copper Cartridge Revolving Derringer, Improved Screw Wrench

On the Durability of Metals

The Best Modes of Testing the Power and Economy of Steam Engines

Read before the Polytechmcbranch of the American Institute, Oct. 22,1868.

By Charles E. Emery

Velocity of Nerve Force

The Blood of Plants

Proposed Method of Sinking the Piers for the St. Louis Bridge

Extract From Report on Illinois and St. Louis Bridge.

By Jas B. Eads

Editorial Summary

The Observations of the Great Solar Eclipse. What has Come of Them

Answers to Correspondents

Manufacturing, Mining, and Railroad Items

Recent American and Foreign Patents

New Publications

“Let Us Have Peace.”

Some Suggestions on the Burning of Coal

The Proposed Darien Ship Canal

Advantage Gained Without Cost

An Important Movement

Improvement in Paint

Inventors and the Patent Office

The Devices on Our Coins and Stamps

Carefulness in the Management of Fire-Arms

Rise and Fall of the North American Lakes

Patents and Claims

Issued by the United States Patent Office


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