Features
Metaline at the American Institute
Accurate Alignments
Bogus State Laws Concerning Patent Rights
Flying Machines - February 20, 1875
Not the Best Way to Sell a Patent
The "Science" of Spiritualism
Irrigation in Colorado
Scientific and Practical Information
Improved Water Motor
Measuring Mountains
Recent Researches in the Spectra of the Planets
The Voices of Animals
Hayden's Revolving Cartridge Belt
Wellman's Improved Car Seat
Improved Plenum and Vacuum Pump
A New Sad Iron
A Hairy Faced Family
Ocean Telegraphy.--The Foreign Connections of New York City and the Existing Rates of Charges
The Post Office a Carrier of Merchandise
Decisions of the Patent Office - February 20, 1875
Recent American and Foreign Patents - February 20, 1875
Canadian Patents - February 20, 1875
Communications Received - February 20, 1875
Departments
- Letters
Correspondence - February 20, 1875
- Recommended
New Books and Publications - February 20, 1875
- Departments
Business and Personal - February 20, 1875
Notes and Queries - February 20, 1875
Index of Inventions - February 20, 1875
