Volume 12, Issue 20
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Features
Mushet on Cast Iron
Polytechnic Association of the American Institute
Smith's Lift and Force Pump
Special Notice
Gillette's Improved Auger
Schaap's Fire Shovel and Sifter
Miscellaneous Summary
River Courses--Canals--Oil Veins
Secret Plans for Extracting Gold
Safes
Starch and Sugar
Purification of Lubricating Oil
Good Will
The Manufacture of Cheap Jewelry
The Circumlocution Office
Death of Dr. Mott
Patent Claims
Issued from the United States Patent-Office