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Improved Engraving Machine

Richard Trevithick Inventor of the Locomotive

Of Thought without Language

By George S. Burleigh

Scientific Intelligence- July 30, 1870

The Hymenopters

By Edward C.H. Day

A New Dodge in Hair Dyes

Experiments with Hydrate of Chloral

By F. A. Howig

Alexander's Safety-Cap for Molasses, Varnish, and Oil Cans

Duckham's Hydrostatic Weighing Machine

Floato-Static Breakwater

Can Mineral Matter be Assimilated in the Animal Economy?

New Mechanical Movements- July 30, 1870

A New Bleaching Agent

Bessemer Steel--American Improvements

Our Correspondence- July 30, 1870

Progress of Invention Abroad- July 30, 1870

Liebig's Extract of Meat

How Inventors are Appreciated in Congress

Action of Sea Water on the Metallic Fastenings of Ships

Public Parks and Floral Decorations

Answers to Correspondents- July 30, 1870

Recent American and Foreign Patents- July 30, 1870

Applications for the Extension of Patents- July 30, 1870

Rogers' Patent Price Current Books

Official List of Patents- July 30, 1870


  • Letters

    Correspondence- July 30, 1870

  • Departments

    Business and Personal- July 30, 1870

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