Volume 26, Issue 4
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Features
History of Ice-Making Machinery
Condensed from the Milk Journal.
Soda
Extraordinary Experiments on Steam Boilers
Free Piston Air Pump
Preparation and Composition of Alloys
The American Historical Record
Haupt's Improved Easy Chair
Mechanical Needle Sharpener
Knife Cleaner and Polisher
Teach the Children to Draw
Accurate Workmanship
The Late James Fisk, Jr.
High and Low Steam
Portable Fire Extinguisher
Scientific and Practical Information - January 20, 1872
Pure Air
The Study of Botany
To City Subscribers - January 20, 1872
Recent American and Foreign Patents - January 20, 1872
Under this heading we shall publish weekly notes of some of the more prominent home and foreign patents.