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Features

The Battering Ram as a Tunnel Borer

Education and Book Knowledge

Ozone-A New and Correct Method of Supply

The State of the Iron Trade

The Iron Ores of Missouri

Modern Progress of Chemical Industries in Europe

South African Wonders--Explosive Diamonds and Turtles with Teeth

The English Telegraphs

The Heberlein Brake

The Siamese Twins

Professor R. A. Proctor

The Ribbon Post

Scientific and Practical Information - February 21, 1874

Combined Lounge and Bath Tub

Improved Bearing for Shafting

Improved Cotton Worm Destroyer

The Artificial Manufacture of Butter

Decisions of the Courts - February 21, 1874

United States Circuit Court--Northen District of Illinois

Importance of Advertising

Recent American and Foreign Patents - February 21, 1874

Answers Correspondents - February 21, 1874

Communications Received - February 21, 1874

Canadian Patents - February 21, 1874

List of Patents Granted in Canada, January 3, 1873

Departments

  • Letters

    Correspondence - February 21, 1874

  • Recommended

    New Books and Publications - February 21, 1874

  • Departments

    Business and Personal - February 21, 1874

  • Index of Inventions - February 21, 1874

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The Essential Guide to the Modern World

The Essential Guide to the Modern World