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Hotchkiss's Atmospheric Forge Hammer

Die Engraving, Sinking and Multiplying

By J. Newton

Commodore Farragut's Report of the Action in Mobile Bay

Oil Entering a Steam Cylinder Against Pressure

Polytechnic Association of the American Institute

The One Thousand-Pounder Cannon

The Power Required to Start a Train

Miscellaneous Summary

A Seed-Bag

Ross's Lubricator

A New Light for Manufactories

Invidious Comparisons

Cooper Union--Free Night School of Science and Art

The Moisture On a Lamp Chimney

A Battery of 15-Inch Guns

Patent Claims

Issued from the United States Patent-Office for the Week Ending September 20, 1361

Recent American Patents

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