Features
Obach's Galvanometers
Natural History in Public Schools
The Making of Steel Pens
Petroleum for Heat
Marengo Cavern
Automatic Circuit Closer
Counterbalance
Novel Sewing Machine Shuttle
Wagon Tongue Support
Fire Arm
Deep Rock Cuts Near New York
The Cable Cars of the Brooklyn Bridge
The Crowned Pigeon
Pole and Shaft for Vehicles
The Champion Steam Trap
Agricultural Inventions
Miscellaneous Inventions
Engineering Inventions
Mechanical Inventions
Departments
- Departments
Correspondence
Business and Personal
New Books and Publications
Index of Inventions
Notes and Queries
