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Air Spring Printing Press

Novel Mode of Sawing Wood Without a Saw

The Kaolin of the United States

Cincinnati Exposition 1872

The Unit Measure of Electrical Resistance

Portable Frescoes

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

A New Patent Law in Canada

Weight, Pressure, Force, Power, Work

Rubber Graphite Paint

Progress of the Eight Hour Strike

Recent American and Foreign Patents - June 22, 1872

New Patent Law in Canada II


  • 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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June 22, 1872