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    Features

    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

    Hose Coupling

    Sewing Machine - July 27, 1872

    Narrow and Cheap Railways

    The Two Oceans

    Oxyhydrogen Street Lamps

    Paper Hangings and their Manufacture

    End of the Eight Hour Strike

    Solid Emery Grinder

    The Nature of Comets

    Recent American and Foreign Patents - July 27, 1872

    New Patent Law in Canada - July 27, 1872

    Departments

    • 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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    July 27, 1872

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