Volume 4, Issue 15
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Features
Romance of the Steam Engine
Column of Varieties
The Armstrong Gun a Failure
The Commissioner of Patents—New Examiners
Can the Rifling of Guns be Dispensed With
Our Secession Troubles
Wealth—A Review of the Subject
The Polytechnic Association of the American Institute
Patent Claims - April 13, 1861
Issued from the United States Patent Office