Features
An Official Geological Organization
Testing of Our Great Guns
The American Chemical Society
Condition of Workingmen in Michigan
A Device for Thawing Ice from Pipes
An Improved Car Coupling
An Improved Receiving Telephone
A Device for Cleaning Wood Saws
An Improvement in Flush Hinges
A Powerful Steam Crane
Jupiter
The Kenwood Physical Observatory
New Toboggan Slide for Bathers
Departments
- Letters
Correspondence- September 12, 1891
- Departments
Business and Personal- September 12, 1891
Notes and Queries- September 12, 1891
Recently Patented Inventions- September 12, 1891
To Inventors- September 12, 1891
Index of Inventions- September 12, 1891
