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    Features

    Big Guns for Coast Defense

    Progress of Aluminum

    Pigeons as Dispatch Carriers

    A Mountain Railway Near New York City

    A Refrigerator Vehicle for Perishable Articles

    An Automatic Steam Boiler Feeder

    A Brake for Street Cars

    A Cork-Drawing Device

    A Marker for Wood-Workers

    An Improved Elevator Gate

    An Improved Wrench

    The Defense of New York

    Cure of Consumption--An Interview with Professor Koch

    By Charles Hacks

    Safe Construction of Buildings

    Electric Chimes

    Departments

    • Letters

      Correspondence- December 6, 1890

    • Recommended

      New Books and Publications- December 6, 1890

    • Departments

      Business and Personal- December 6, 1890

    • Recently Patented Inventions- December 6, 1890

    • Notes & Queries- December 6, 1890

    • Index of Inventions- December 6, 1890

    • To Inventors- December 6, 1890

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    December 06, 1890

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