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Features

“How Steel Hardens”

Mr. Converse's Patent Bill

Approximate Economy of Gas and Electric Lighting

Why the Thunderer's Gun Burst

The Corundum Mines of North Carolina

Artificial Ice Skating Rink, New York.

Improved Revolving Derrick

Agricultural Inventions

New Egg Beater

New Agricultural Engine

Life Preserver Exhibitor

American Industries--No. 31.

New Steering Apparatus

The Binary Absorption System of Refrigeration

Marine and Land Hermit Crabs

By A. W. Roberts

Miscellaneous Inventions

The Steam Velocipede

The Electric Sun

Engineering Inventions

Departments

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    Correspondence

  • Business And Personal

  • Notes and Queries

  • New Books And Publications

  • Index of Inventions

  • Patents

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February 21, 1880