Features
Patent Law Amendments
Can Ants Talk?
Prospects for 1875
The Sewing Machine
An Ancient Metric System
Science Record for 1875
The Underground Railway, New York City
Combined Wrench and Bolt Cutter
Baker's Improved Bootjack
The Belgian Mode of Lowering Miners in Shafts
Practical Mechanism
Improved Camp Lounge
Improved Grate Bar
Remarkable Birds
Recent American and Foreign Patents - February 13, 1875
Decisions of the Courts
Communications Received - February 13, 1875
Canadian Patents - February 13, 1875
Departments
- Letters
Correspondence - February 13, 1875
- Departments
Notes and Queries - February 13, 1875
Business and Personal - February 13, 1875
Index of Inventions - February 13, 1875
