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Features

Improved Toggle-Joint Press, Steel Rifle Barrels, and more

Notes on Military and Naval Affairs

Shepherd's Patented Well Curb

Polytechnic Association of the American Institute

The Colors of Coal Tar

The Discoveries of 1861

Secrets of the Bessemer Process

Extension of Patents--For Whose Benefit they are Granted

The Last Phase of the Armstrong Gun

The Excitement in Relation to Iron-Plated Ships

The British Iron-Clad Navy

Recent Foreign Inventions and Discoveries

Piedmont Gold Mining and Amalgamating System

The Great Exhibition

To Our Readers

Recent American Inventions

Patent Claims

Issued from the United States Patent Office

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  • Notes and Queries

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May 10, 1862

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