Features
The Illumination of Art Galleries
American Oyster Culture
The Patent Office
Solvents for Rubber
Polychrome Printing
Scientific and Practical Information - December 12, 1874
To our Present and Future Subscribers
The Coal and Iron Products of the World
A Device for Preventing Priming
Wire Tramways
The Underground Railway, New York City
Practical Mechanism - December 12, 1874
New Railway Tunnel under the Hudson River, between New York and Jersey City
The City of Pittsburgh and its Industries
A New Hot Air Balloon
Safety Catch for Cranes
Recent American and Foreign Patents - December 12, 1874
Answers to Correspondents
Communications Received - December 12, 1874
Canadian Patents - December 12, 1874
Departments
- Letters
Correspondence - December 12, 1874
- Departments
Business and Personal - December 12, 1874
Index of Inventions - December 12, 1874
