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    Features

    Combined Safety Valve and Low-Water Alarm

    Patent Right and Copyright

    Fur Seal Fishery in Alaska

    Comparison of the Refrigerative Effects of the Carre Apparatus and Common Ice

    Deformed Feet and Shoes

    By Duff Child

    Barnacles

    The Narwhal or Sea Unicorn

    Wormood's Revolving Pay Box

    Vertical Multiplier

    Scientific Intelligence - April 16, 1870

    Screw Piles

    Conklin's Detachable Lip for Bowls, Basins, Etc.

    Boiler Explosions

    Telo-Dynamic Cables

    Power and Efficiency of Screws

    International Exhibition of 1871, in London

    Charlatans and Charlatanism

    Report of the New York Commissioners of Fisheries

    Experimental Test of the Laws of the Deflection of Beams

    Editorial Summary- April 16, 1870

    United States Circuit Court at New Orleans

    Patent Office Decision- April 16, 1870

    Answers to Correspondents- April 16, 1870

    Recent American and Foreign Patents- April 16, 1870

    Official List of Patents- April 16, 1870

    Departments

    • Letters

      Correspondence- April 16, 1870

    • Recommended

      New Books and Publications- April 16, 1870

    • Departments

      Business and Personal- April 16, 1870

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    April 16, 1870