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Improved Hotel Annunciator, Making Steel from Iron with Gas

Notes on Military and Naval Affairs

Metallurgy of Copper and Zinc

Surface Condensers for Steam Engines

The Chemistry of Coal

The Growth of Coral Reefs

Discussion on Gunpowder

History of the Heliographic Art in Europe and America

By M. A. Root

The Explosion of Gunpowder

Professor Agassiz in Brooklyn

Malleableizing Cast Iron

Culpable Losses of Army Horses

The Comparative Economy of Steam and Water Power

Sulphurous Acid As a Disinfectant

More About Nova Scotia Gold Fields

Enameling Iron

Salting Streets--The Science of the Question

Notes on Foreign Inventions and Discoveries

Recent American Inventions

Patent Claims

To Our Readers

Mayhew's Patent Kerosene Lamp


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February 15, 1862