Features
On Aids to Hearing
Progress of the Brush System of Electric Lighting
Electro-Metallurgy
Professor Gamgee's Ice Machine
Harvest Figures
Improved Tongs
Steamboats for South American Rivers
Portable Fountain Water Closet
Improvement in Machine Guns
Howe's Cave
The Chicago Police Alarm System
Engineering Inventions - January 15, 1881
The Face in Health and Disease
A Mysterious Explosion and its Causes
Curious Time Measurers
Mechanical Inventions - January 15, 1881
Agricultural Inventions - January 15, 1881
Miscellaneous Inventions - January 15, 1881
Cellar for Manufacturing Ice
Human Footprints in Kentucky Sandstone
Departments
- Departments
Recent Inventions - January 15, 1881
Index of Inventions - January 15, 1881
Business and Personal - January 15, 1881
Notes and Queries - January 15, 1881
