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Combined Safety Valve and Low-Water Alarm

Patent Right and Copyright

Fur Seal Fishery in Alaska

Deformed Feet and Shoes

By Duff Child

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

The Narwhal or Sea Unicorn


Vertical Multiplier

Scientific Intelligence - April 16, 1870

Wormood's Revolving Pay Box

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

Report of the New York Commissioners of Fisheries

Charlatans and Charlatanism

Experimental Test of the Laws of the Deflection of Beams

Editorial Summary- April 16, 1870

Patent Office Decision- April 16, 1870

United States Circuit Court at New Orleans

Answers to Correspondents- April 16, 1870

Recent American and Foreign Patents- April 16, 1870

Official List of Patents- April 16, 1870


  • Letters

    Correspondence- April 16, 1870

  • Recommended

    New Books and Publications- April 16, 1870

  • Departments

    Business and Personal- April 16, 1870

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