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Features

Improved Helical Turbine

Visit to a Petroleum Refinery

Recent American Patents

Is the Blockade Effective

Wool from Pine Trees

Special Notices

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

Inactivity

Experiments With Car Brakes

What a Great Thing An Army Is

The Sweetness of Fermented Bread

Patent Claims

Issued from the United States Patent-Office

Riley's Caster

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February 18, 1865

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