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    Features

    A New Grain Elevator

    Making Excuses

    Diphtheria

    A Valuable Gift by Chemistry to the World

    Publishers' Card

    Six Good Reasons Why Every Manufacturer, Mechanic, Inventor, and Artisan Should Become a Patron of the Scientific American

    Working Men's Reading Rooms

    Weak Sparks

    That Obnoxious Postal Law

    Recent Improvements in the Screw Propeller

    Steam Cultivation

    Robertson's Iron Fence

    A Non-Retreating Bunsen Burner

    By Henry Morton

    Improved Screw Cutting Die and Holder

    Donkey Pump

    Plate Shearing Machinery

    The Krupp Twelve Hundred Pounder Gun

    The Trinity Shoals Lighthouse

    Recent American and Foreign Patents - December 18, 1875

    New Agricultural Inventions

    New Woodwork and House and Carriage Building Inventions - December 18, 1875

    New Mechanical and Engineering Inventions - December 18, 1875

    New Household Articles - December 18, 1875

    New Chemical and Miscellaneous Inventions - December 18, 1875

    Communications Received - December 18, 1875

    Canadian Patents - December 18, 1875

    Departments

    • Letters

      Correspondence - December 18, 1875

    • Recommended

      New Books and Publications - December 18, 1875

    • Departments

      Notes and Queries - December 18, 1875

    • Business and Personal - December 18, 1875

    • Index of Inventions - December 18, 1875

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    December 18, 1875