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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

Floato-Static Breakwater

Duckham's Hydrostatic Weighing Machine

A New Bleaching Agent

New Mechanical Movements- July 30, 1870

Can Mineral Matter be Assimilated in the Animal Economy?

Bessemer Steel--American Improvements

Liebig's Extract of Meat

Progress of Invention Abroad- July 30, 1870

Our Correspondence- July 30, 1870

Action of Sea Water on the Metallic Fastenings of Ships

Public Parks and Floral Decorations

How Inventors are Appreciated in Congress

Answers to Correspondents- July 30, 1870

Rogers' Patent Price Current Books

Recent American and Foreign Patents- July 30, 1870

Applications for the Extension of Patents- July 30, 1870

Official List of Patents- July 30, 1870


  • Letters

    Correspondence- July 30, 1870

  • Departments

    Business and Personal- July 30, 1870

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July 30, 1870

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