Volume 22, Issue 8
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Features
Manufacture of Cotton Seed and Cotton Seed Oil
On the Uses of Zinc
On Ox Gall
Aniline Green for Wool
The Preservation of Meat
Preservation of Ice
Improved Bedstead and Mattress for Invalids
Improved Clothes Dryer
More about Niin
The Hydrostatic Test for Steam Boilers
Improvement in Key-Hole Guards
Penny's Improved Gang Sawmill
Six-Way Tap for Gas and Water
The Pneumatic Tunnel under Broadway, New York
Proposed Modification of the Patent Laws—An Attempt to Break Down the Right of Appeal
Official Report of Professor Chandler to the Board of Health on the New York Gas Companies
What is Chemistry?
Bent, Stained, and Ornamental Window Glass
Curious Ice Formations
Award of our Cash Prizes
Recent American and Foreign Patents- February 19, 1870
Official List of Patents- February 19, 1870
Issued by the United States Patent Office. FOR THE WEEK ENDING FEB. 8 ,1870. Reported Officially for the Scientific American.