Features
Improvement Needed in Secondary Batteries
A Roller Pressure Regulator for Cane Mills
A Proposed Apparatus for a Fall of 1,000 Feet
A Velocipede Operated by Hand Levers
An Improved Bicycle Treadle
An Improved Gauge Cock
The United States Life Saving Service
Triple Expansion Engines for a Tugboat
Serpollet's Steam Carriage
Centrifugal Action of Air
Engineering and Mechanics
Experimental Science- February 21, 1891
The Scientific American
Departments
- Letters
Correspondence- February 21, 1891
- Departments
Notes and Queries- February 21, 1891
Recently Patented Inventions- February 21, 1891
Business and Personal- February 21, 1891
Notes & Queries- February 21, 1891
Index of Inventions- February 21, 1891
To Inventors- February 21, 1891
