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Features

Improved Camera Stand

French Chemists on Austrian Gun-Cotton

Invisible Radiation of the Electric Light

Egan's Kerosene Oil Burner

Schleier's Indented Rail

Farmers' Club

Carleton's Submerged Glass Pump

Resistance of Vessels in Water

Recent American Patents

Ancient Mexican Zodiac

A Unit of Heat and Specific Heat

Foot-Pounds of Work

The Lenoir Gas Engine

Cheap Solvent for Gold

Salt as a Fertilizer

Special Notices

The Game of Croquet

Miscellaneous Summary

Patent Claims

Issued from the United States Patent-Office

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May 20, 1865

Confronting Common Wisdom