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Features

Air Spring Printing Press

Novel Mode of Sawing Wood Without a Saw

The Kaolin of the United States

Portable Frescoes

The Unit Measure of Electrical Resistance

Cincinnati Exposition 1872

New Magneto-Electric Machine

Safety Kerosene Lamp

Pencil Leads

Crystallization of Silver, Gold, and other Metals

By John Hall Gladstone

The New State Capitol at Albany, NY

Progress of the Eight Hour Strike

Weight, Pressure, Force, Power, Work

Rubber Graphite Paint

A New Patent Law in Canada

New Patent Law in Canada II

Recent American and Foreign Patents - June 22, 1872

Departments

  • Letters

    Correspondence - June 22, 1872

  • Departments

    Business and Personal - June 22, 1872

  • Notes and Queries - June 22, 1872

  • Index of Inventions - June 22, 1872

  • Index - June 22, 1872

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Why Do Facts Fail?

Why Do Facts Fail?

Deconstructing Denial