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    Features

    Improved Steam Trap

    Writing Fluids

    Double Turbine Water Wheel

    Adjustable Plow

    The Carpenter Bee

    Simple Apparatus for Out-Door Sketching

    Paper Boats—How Made

    Improved Shops

    Scientific and Practical Information - September 14, 1872

    Railway Rail Joint

    Albany Steam Trap

    The Star Sirius

    Terrestrial Magnetism - September 14, 1872

    Substances Acting Mechanically to Prevent the formation of Scale in Boilers

    An Astronomical Robbery

    The Newark Industrial Exposition

    Renewed Activity at the Patent Officer—Re Organization and New Classification—Appointment and Promotions

    Letter from Professor R. H. Thurston - September 14, 1872

    Recent American and Foreign Patents - September 14, 1872

    Foreign Patents—A Hint to Patentees

    New Patent Law in Canada - September 14, 1872

    Departments

    • From the Editor

      Answers to Correspondents - September 14, 1872

    • Letters

      Correspondence - September 14, 1872

    • Recommended

      New Books and Publications - September 14, 1872

    • Departments

      Business and Personal - September 14, 1872

    • Notes and Queries - September 14, 1872

    • Index of Inventions - September 14, 1872

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    September 14, 1872

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