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Improvement in the Steam Engine

Notes on Military and Naval Affairs

Polytechnic Association of the American Institute

Hunter's Army and Travelers' Compass

The Craig Microscope

Ludlow's Sliding Stop Valve

Grease and India Rubber

Americans at the Great English Exhibition

A Good Move in Life Insurance

Torpedoes to Destroy Vessels

Revolving Turrets for Barbette Guns

Printing in Colors

Recent American Inventions

Patents Claims

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June 07, 1862

The Antidote to Anti-Intellectualism