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Improved Bolt Cutter, Improved Self-Connecting Car Coupling, and more

The Manufacture of Fire Bricks

Chemical News

The Guava

By John R. Gordon

Something about Silver

By Charles A. Joy

What are Condiments?

Improved Implement for Drawing Nails

Natural History--The Great Auk

By James Orton

Improved Coal-Breaking Machine

The Yosemite Valley

Rapid Telegraphy

Portable Laughing Gas

An Invisible Chain and a Silent Conflict

The Darien Canal--Will it Pay to Build it?

Butter and Its Adulterations

The Wind Month

The Study of Alloys

How Fire Bricks are Made

Economy in the Use of Time

U. S. Patent Office

Answers to Correspondents- April 2, 1870

Recent American and Foreign Patents- April 2, 1870

Official List of Patents- April 2, 1870


  • Letters

    Correspondence- April 2, 1870

  • Recommended

    New Books and Publications- April 2, 1870

  • Departments

    Business and Personal- April 2, 1870

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April 02, 1870