Volume 19, Issue 21
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Features
Patent Copper Cartridge Revolving Derringer, Improved Screw Wrench
The Best Modes of Testing the Power and Economy of Steam Engines
Read before the Polytechmcbranch of the American Institute, Oct. 22,1868.
On the Durability of Metals
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.
Editorial Summary
The Observations of the Great Solar Eclipse. What has Come of Them
New Publications
Answers to Correspondents
Recent American and Foreign Patents
Manufacturing, Mining, and Railroad Items
The Proposed Darien Ship Canal
Some Suggestions on the Burning of Coal
“Let Us Have Peace.”
Improvement in Paint
Inventors and the Patent Office
Advantage Gained Without Cost
The Devices on Our Coins and Stamps
Rise and Fall of the North American Lakes
Carefulness in the Management of Fire-Arms
An Important Movement
Patents and Claims
Issued by the United States Patent Office