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Machine for Bunching, Wiring, and Inserting Bristles in Brush Backs


Phenomena Associated with a Hydrogen Flame


Carriage Wheel

Brick and Mortar Elevator and Distributor

The Gatling Gun—Does History Repeat Itself?

Pressure on Foundations

Railroad Car Brake

Railroad Rail

Summer Heats in Various Countries

The Domestic Telegraph

The New Patent Law of Canada - July 20, 1872

Letter from Professor R. H. Thurston

Recent American and Foreign Patents - July 20, 1872


  • From the Editor

    Answers to Correspondents - July 20, 1872

  • Letters

    Correspondence - July 20, 1872

  • Departments

    Notes and Queries - July 20, 1872

  • Business and Personal - July 20, 1872

  • Index of Inventions - July 20, 1872

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