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

The Manufacture of Fire Bricks

Chemical News

Something about Silver

By Charles A. Joy

The Guava

By John R. Gordon

What are Condiments?

Improved Implement for Drawing Nails

Natural History--The Great Auk

By James Orton

The Yosemite Valley

Portable Laughing Gas

Improved Coal-Breaking Machine

Rapid Telegraphy

An Invisible Chain and a Silent Conflict

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

The Wind Month

Economy in the Use of Time

How Fire Bricks are Made

Butter and Its Adulterations

The Study of Alloys

U. S. Patent Office

Recent American and Foreign Patents- April 2, 1870

Answers to Correspondents- April 2, 1870

Official List of Patents- April 2, 1870


  • Letters

    Correspondence- April 2, 1870

  • Reviews

    New Books and Publications- April 2, 1870

  • Departments

    Business and Personal- April 2, 1870

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