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Features

Improved Napping Machine

Recipes and Experiments - August 31, 1872

How to Make a Cheap Hydrogen Lamp

Mold For Casting and Chilling Sleigh Shoes

Law's Shuttle Binder

Manufacture of Pins

Goodridge's Automatic Lamp Extinguisher

Spring Power for Sewing Machines

Terrestrial Magnetism

Tunnel under the Harlem River, New York

The International Exposition at Vienna, 1873

William Bridges Adams

Security against Thieves

The International Statistical Congress

A New Suspension Bridge

Promotions at the Patent Office

The New Railways across the Continent

The Coolest Place in New York

Improvements that are much Needed

The Electrical Railway Alarm

Why It Has Been So Hot

Diamonds in Arizona

A New Canal Steamer

Old and New Steam Engines

The Meteors of August Tenth

Scientific and Practical Information - August 31, 1872

Letter from Professor R. H. Thurston - August 31, 1872

Recent American and Foreign Patents - August 31, 1872

New Patent Law in Canada - August 31, 1872

Departments

  • From the Editor

    Answers to Correspondents - August 31, 1872

  • Letters

    Correspondence - August 31, 1872

  • Recommended

    New Books and Publications - August 31, 1872

  • Departments

    Business and Personal - August 31, 1872

  • Notes and Queries - August 31, 1872

  • Index of Inventions - August 31, 1872

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August 31, 1872

Beyond XX and XY

Biology. Identity. Equality.