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Features

Improved Hotel Annunciator, Making Steel from Iron with Gas

Notes on Military and Naval Affairs

Metallurgy of Copper and Zinc

The Chemistry of Coal

Surface Condensers for Steam Engines

Discussion on Gunpowder

The Growth of Coral Reefs

History of the Heliographic Art in Europe and America

By M. A. Root

Culpable Losses of Army Horses

Professor Agassiz in Brooklyn

The Explosion of Gunpowder

Malleableizing Cast Iron

The Comparative Economy of Steam and Water Power

Enameling Iron

More About Nova Scotia Gold Fields

Sulphurous Acid As a Disinfectant

Salting Streets--The Science of the Question

Patent Claims

Recent American Inventions

Notes on Foreign Inventions and Discoveries

To Our Readers

Mayhew's Patent Kerosene Lamp

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February 15, 1862

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