Features
The Chemical History of a Candle
Romance of The Steam Engine
An Historical Sketch of Air Engine From the Year 1700
Use and Abuse of the Eyesight
Column of Varieties
The New Patent Law
Encyclopdias and Explosions
Bank Capital Consists of Merchandise
The Lumber Trade—Sawing Operations
The Polytechnic Association of the American Institute
Patent Claims - April 6, 1861
Rates of Advertising
Change in the Patent Laws
Naylor & Co.'s Cast Steel Bells
Prospectus of the Scientiflc American
Departments
- Letters
Correspondence - April 6, 1861
- Departments
Notes and Queries - April 6, 1861
