Features
The Scientific Meeting at Toronto
The Sewage Disposal Problem
An Improved Road Cart
An Improved Roofing Tank Apparatus
An Improved Blow-Off Cock and Fire Extinguisher
An Improved Drawbridge Gate
An Improved Dumping Car
An Improved Oil Can
Rheostat and Resistance Column
Improved Lock and Shackle for Railway Switches
Launch of the Philadelphia
New Arc Lamp
The Harlem River Aqueduct Tunnel and Its Approaches
Photographic Notes- September 14, 1889
With Mr. Edison on the Eiffel Tower
An Attractive Cheap Dwelling House
The Paris Exhibition
Departments
- Letters
Correspondence- September 14, 1889
- Departments
Business and Personal- September 14, 1889
Notes and Queries- September 14, 1889
Recently Patented Inventions- September 14, 1889
Index of Inventions- September 14, 1889
To Inventors- September 14, 1889
