Features
Contract Awarded for Two Dreadnoughts
Navy to Build “Octopus” Type of Submarine
Electric Power Plants are Responsible
The Steel Rail Problem
Gasoline Motor Cars Adopted for Branch Line Service on the Union Pacific Railroad
The Grand Prix International Automobile Race
A Traction Wheel with Sinusoidal Tread
Sand Painting
The Riddle of Mars
How Linoleums and Oilcloths are Made
Captive Balloons in the German Army and Navy
Some Interesting Tricks
Apparatus for Sustaining and Directing Balloons
Patent Department
Railway Track Construction
The Plug Puzzle
An Improved Button Latch
Departments
- Departments
Correspondence - July 13, 1907
Recently Patented Inventions - July 13, 1907
New Books, Etc. - July 13, 1907
Notes and Queries - July 13, 1907
Index of Inventions - July 13, 1907
Patents - July 13, 1907
