Volume 6, Issue 19
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Features
Notes on Military and Naval Affairs
The Colors of Coal Tar
Polytechnic Association of the American Institute
Shepherd's Patented Well Curb
The Discoveries of 1861
The Excitement in Relation to Iron-Plated Ships
The Last Phase of the Armstrong Gun
Extension of Patents--For Whose Benefit they are Granted
The British Iron-Clad Navy
Secrets of the Bessemer Process
Piedmont Gold Mining and Amalgamating System
Recent Foreign Inventions and Discoveries
The Great Exhibition
Patent Claims
Issued from the United States Patent Office