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The Prall Automatic Steam Vacuum Pump

The Hands of the Nation

Lightning Rods

New Steam Dredging Boats

Improved Bung

Armored Can

A Bridle Bit that is Something More, and an Improved Stocking for Horses

Saving of Time—A Serious Charge against the Scientific American

Scientific and Practical Information - July 27, 1872

Sewing Machine - July 27, 1872

Hose Coupling

The Two Oceans

Oxyhydrogen Street Lamps

Narrow and Cheap Railways

Solid Emery Grinder

Paper Hangings and their Manufacture

End of the Eight Hour Strike

The Nature of Comets

Recent American and Foreign Patents - July 27, 1872

New Patent Law in Canada - July 27, 1872


  • From the Editor

    Answers to Correspondents - July 27, 1872

  • Letters

    Correspondence - July 27, 1872

  • Recommended

    New Books and Publications - July 27, 1872

  • Departments

    Business and Personal - July 27, 1872

  • Notes and Queries - July 27, 1872

  • Index of Inventions - July 27, 1872

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