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Improved Helical Turbine

Visit to a Petroleum Refinery

Is the Blockade Effective

Recent American Patents

Special Notices

Wool from Pine Trees

Remarks on the Subject of Force in General

By John A. Roebling

Count Rumford's Discover That Heat is Motion

Mr. Mushet and the Bessemer Process

The Railroad Under Broadway

Ordnance and Armor

The Cause of Boiler Explosions


The Sweetness of Fermented Bread

What a Great Thing An Army Is

Experiments With Car Brakes

Patent Claims

Issued from the United States Patent-Office

Riley's Caster


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