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Iron Bridge at Topeka, Kansas

Strange Drinks

S. A. Woods' Self-Oiling Circular-Saw Arbors and Adjustable Cone Bushing

Nickel-Plating--Interesting to Marine Engineers

Mechanical Fingers

The Hesperians

By Edward C.H. Day the School of Mines, Columbia College

The Scientific Education of Women

Synopsis of the Amended Patent Law - July 23, 1870

How the Heirs of an Inventor May be Rewarded

Experiments with Gun Cotton

The Manufacture of Beet-Root Sugar in England

Projected Ship Canals

Paper and Paper Stock

Friction Matches

Artificial Ultramarine

American Institute Exposition

The Right of Appeal Maintained

Scientific Intelligence- July 23, 1870

Report of the Department of Agriculture for May and June

Recent American and Foreign Patents- July 23, 1870

Answers to Correspondents- July 23, 1870

Applications for the Extension of Patents

Official List of Patents- July 23, 1870


  • Letters

    Correspondence- July 23, 1870

  • Departments

    Business and Personal- July 23, 1870

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July 23, 1870