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Features

A Mammoth Band Saw

Dangerous Mineral Oils

Sailing Faster Than the Wind

A Uniform System of Colors

Papin's Digester for Cooking

Scientific and Practical Information

The Invention of the Leyden Jar

Barber's Hair Blowing Apparatus

Early Plans for Railways

Elastic Washing Mitts

Improved Folding Chair

The Pantagraph

Screw Driver Attachment

Grocer's Sample Case

Soap Holder

Improved Wash Boiler Attachment

Bradley's Cushioned Hammer

Blasting in a Coal Mine

Decisions of the Courts

United States Circuit Court

Patent Office Decisions

Recent American and Foreign Patents

Answers to Correspondents

Communications Received

Departments

  • Departments

    Correspondence - March 22, 1873

  • New Books and Publications - March 22, 1873

  • Business and Personal - March 22, 1873

  • Notes and Queries - March 22, 1873

  • Index of Inventions - March 22, 1873

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Why Do Facts Fail?

Why Do Facts Fail?

Deconstructing Denial