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Features

Cigar Machine, Scientific Nonsense and more

The Niin of Yucatan

From the Report of the United States Commissioners of Agriculture.

The Cotton Gin and Its Inventors

By Elzy Hay

Albumen

By C. Widemann

Iron Shipbuilding and American Commerce

By Henry E. Colton

Manufacture of Cotton Seed, Cotton Seed Cakes, and Meal

By C. Widemann

The French System of Storm Maps

From the February Number of "Old and New."

On Zinc

By Charles A. Joy

Construction of Hollow Walls

New Apparatus for Measuring Oil

Steam Engines at the American Institute

Domestic Water Filters

A New English Oil Testing Apparatus

Solutions for Hardening Steel

The Rumford Medals

Study of First Principles by Inventors

Pumping Down Buildings--Fall of the Dining Hall of King's College, London

Black River Flood Case

Foremen and Superintendents

Test of Turbine Water Wheels at Lowell, Mass

Diving and Diving Apparatus

Tunnels vs Bridges

What is Said of Our Prize Engraving

Applications for Extension of Patents- February 5, 1870

On Refrigerating Mixtures and the Depression of Temperature Produced by Dissolving Salts in Water

Recent American and Foreign Patents- February 5, 1870

Under this heading we shall publish weekly notes of some Of the more prominent home and foreign patents.

Answers to Correspondents- February 5, 1870

Official List of Patents- February 5, 1870

Issued by the United States Patent Office. FOR THE WEEK ENDING JAN. 25, 1870. Reported Officially for the Scientific American

Departments

  • Letters

    Correspondence- February 5, 1870

  • Departments

    Business and Personal- February 5, 1870

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February 05, 1870