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    Features

    Improvements Needed in the New Navy

    The Ammonia Motor

    An Improved Piano Action

    Improved Safety Devices for Elevators

    An Improved Freight Car Door

    Towing Canal Boats by Electricity

    A Method of Tunneling

    By Harold Avery

    Vertical Cylinder Boring Machine

    Improved Siphon Condenser

    The World's Fair Franklin Statue

    A Bow for Stringed Musical Instruments

    An Improves Dumping Car

    An Improved Weed Puller

    To Inventors- January 23, 1892

    Patents- January 23, 1892

    Departments

    • Letters

      Correspondence- January 23, 1892

    • Recommended

      New Books and Publications- January 23, 1892

    • Departments

      Business and Personal- January 23, 1892

    • Recently Patented Inventions- January 23, 1892

    • Notes and Queries- January 23, 1892

    • Index of Inventions- January 23, 1892

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    January 23, 1892

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