Volume 11, Issue 20
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Features
Donald Mckay's Defense of the Navy
The Geology of Petroleum
Improvement in Photography
The Engines of the “Dictator”
Recent American Patents
Interesting English Patents
The “Union” Lamp
Fine Tools
Location of Steam Gages and Indicators
Extension of Patents--For Whose Benefit they are Granted
Light Wanted
War a Stimulant to Invention
Making Sirup from Corn
The Rocks in Which Petroleum is Found
Second Trial of the 1,000-Pounder
New Books and Publications
Purifying Gas by Oxide of Iron
Patent Claims
Issued From The United States for the week ending November 1, 1864 Reported official for the scientific American