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    Features

    Improved Method of Propelling Canal boats

    The Remington Works Ilion, NY

    Diamond Cutting in New York

    Measuring the Velocity of Rotation

    Fastenings for Neck Ties, Scarfs, Etc.

    The Baltimore Boiler Inspection Law

    Heard's Ventilating Hat

    Combined Cast Iron and Wrought Iron Arch Girders

    The Discovery and History of the Chromosphere

    By J. H. Leach

    Inextinguishable Signal Light

    Frictional Gearing - April 13, 1872

    By E. S. Wicklin

    Scientific and Practical Information - April 13, 1872

    Umbrella Frames

    Proposed City Railroad

    Sewing Machines and their Effect Upon Health

    Death Of Samuel F. B. Morse

    The Great Sewing Machine Job before Congress

    Lightning Rods

    A Trades Union Tirade

    Spiritualism Answered by Science

    Recent American and Foreign Patents - April 13, 1872

    Departments

    • From the Editor

      Answers to Correspondents - April 13, 1872

    • Recommended

      New Books and Publications - April 13, 1872

    • Departments

      Notes and Queries - April 13, 1872

    • Business and Personal - April 13, 1872

    • Index of Inventions - April 13, 1872

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    April 13, 1872

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