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Improved Screw and Tapping Machines

Notes on Military and Naval Affairs

United States Circuit Court--Ohio

Polytechnic Association of the American Institute

Extension of Patents--For Whose Benefit they are Granted

Reports of Our Military Commission to Europe

Are Iron-Plated Ships Invulnerable?

Convention of Sorghum Sugar Manufacturers

The Colors from Coal Tar

Recent American Inventions

Recent Foreign Inventions and Discoveries

Patent Claims

To Our Readers


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Dwindling Supply. Increasing Demand.

Dwindling Supply. Increasing Demand.

Solving the Water Crisis