Volume 22, Issue 6
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Features
The Niin of Yucatan
From the Report of the United States Commissioners of Agriculture.
The Cotton Gin and Its Inventors
Albumen
Iron Shipbuilding and American Commerce
Manufacture of Cotton Seed, Cotton Seed Cakes, and Meal
The French System of Storm Maps
From the February Number of "Old and New."
On Zinc
A New English Oil Testing Apparatus
New Apparatus for Measuring Oil
Domestic Water Filters
Steam Engines at the American Institute
Construction of Hollow Walls
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
Test of Turbine Water Wheels at Lowell, Mass
Foremen and Superintendents
Black River Flood Case
What is Said of Our Prize Engraving
Tunnels vs Bridges
Diving and Diving Apparatus
Applications for Extension of Patents- February 5, 1870
On Refrigerating Mixtures and the Depression of Temperature Produced by Dissolving Salts in Water
Answers to Correspondents- February 5, 1870
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.
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