Volume 4, Issue 12
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Features
The Chemical History of a Candle
Bagasse as a Fuel
Romance of the Steam Engine
The New Patent Law
Column of Varieties
The New Patent Law for Designs, Trade Marks, Patterns, Co
Coal and Wood-Burning Locomotives
Comments on the New Patent Law
The Condition of Labor in the City
The Polytechnic Association of the American Institute
Patent Claims - March 23, 1861
Issued from the United States Patent Office
Rates of Advertising
Change in the Patent Laws
New Arrangements--Patents Granted for Seventeen Years