Features
Position of the Planets in May
Rights of Employers to Inventions Made by their Employes
Proctor's Measuring Vessel
Prouty's Saw-Mill Dog
McBride's Observatory Sleeper
The "Florida" Heater for Soft Coal
Radley's Removable Sleigh-Runner
Boomer & Boschert Baling Presses
Desk Fan or Small Dental Motor
An Improved Velocipede
Scientific Diversions
The Mauser Magazine Rifle
Beautiful Example of Diffraction
To Inventors- May 2, 1891
Departments
- Letters
Correspondence- May 2, 1891
- Departments
Business and Personal- May 2, 1891
Recently Patented Inventions- May 2, 1891
Notes and Queries- May 2, 1891
Index of Inventions- May 2, 1891
