Volume 25, Issue 7
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Features
Experiences of a Bureau Officer
A Chapter on American Geology
Wrought Iron Bridges for the Nicolai Railway of Russia
Experimental Investigation of a New Force
Paget's Gipsy Winch
A Valuable Book
Engravings of Inventions and Machinery
Mechanical Movement for Churns, Washing Machines, Etc.
The Late General Rodman
Gold and Silver Waste
Dr. Crookes on Psychic Force
New Application of the Oxyhydrogen Light to the Separation of Metals, by Tessie Du Mo-Tay of Paris, France
How Scientific Men Work
Will Gunpowder Explode in a Vacuum?
Narrow Gage Railways
The Westfield Explosion
Re-Agent to Detect Nitric Acid
Editorial Summary- August 12, 1871
Ozonized Ether
Artificial Leather--Utilization of Leather Scraps and Cuttings
Answers to Correspondents- August 12, 1871
Official Lists of Patents- August 12, 1871
Issued by the U. S. Patent Office