Iron Bridge at Topeka, Kansas

Strange Drinks

Mechanical Fingers

Nickel-Plating--Interesting to Marine Engineers

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

The Hesperians

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

The Scientific Education of Women

How the Heirs of an Inventor May be Rewarded

Synopsis of the Amended Patent Law - July 23, 1870

The Manufacture of Beet-Root Sugar in England

Experiments with Gun Cotton

Projected Ship Canals

Artificial Ultramarine

Friction Matches

Paper and Paper Stock

Report of the Department of Agriculture for May and June

The Right of Appeal Maintained

American Institute Exposition

Scientific Intelligence- July 23, 1870

Applications for the Extension of Patents

Recent American and Foreign Patents- July 23, 1870

Answers to Correspondents- July 23, 1870

Official List of Patents- July 23, 1870