Features
The Elimination of Grade Crossings
Economic Loss of Overcrowding
The Transatlantic Record
Science
Electricity
Engineering
Counting Our People by Machine
How Sudd Chokes the Nile River
The Recent Curious Eclipse of the Sun
The Seven Bridges of Königsberg and Other Puzzles
Termination of the Rheims Aviation Meeting
A Novel Cantilever Grain Elevator
Dr. Cook's Discovery of the North Pole
Departments
- Departments
Correspondence
Index of Inventions
Patents
New Books, Etc.
Notes and Queries
Recently Patented Inventions