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    Features

    The Hydraulic Annexe at the Centennial Exposition

    Is the Universe Composed Entirely of Hydrogen!

    Berthelot's New Electro-Chemical Discoveries

    Ocular Color Spectra and Their Causation

    Shall We Change Our Weights and Measures?

    A New Theory of Hay Fever

    Improved Mortising Machine

    New Gatling Gun

    Improved Split Wheel

    Improvements in Fire Engines

    A New Soldering Machine

    Potato Pest Poison.

    By Charles V. Riley

    Practical Mechanism - August 19, 1876

    By Joshua Rose

    Improved Woodworking Machinery - August 19, 1876

    Leland's Pipe Coupler

    Meteorites - August 19, 1876

    By C. A. Young

    Two Beautiful Palms

    Exhibits of Foreign Technical Schools at the Centennial

    Recent American and foreign Petents - August 19, 1876

    New Household Inventions - August 19, 1876

    New Agricultural Inventions - August 19, 1876

    New Mechanical and Engineering Inventions - August 19, 1876

    New Chemical and Miscellaneous Inventions - August 19, 1876

    Communications Received - August 19, 1876

    The Validity of Patents - August 19, 1876

    Departments

    • Letters

      Correspondence - August 19, 1876

    • Departments

      Notes and Queries - August 19, 1876

    • Business and Personal - August 19, 1876

    • Index of Inventions - August 19, 1876

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    August 19, 1876