Features
Mechanical Hand Rake
Tool for Drawing Broken Pump Rods
Polytechnic Association of the American Institute
The Law of Successive Species
Some Facts About Peru
The Metric System
Turning Tools
Editorial Correspondence
Professor Page the Inventor of the Ruhmkorff Coil
Guns Bursting in Action
Hardening and Tempering Steel
Adulterating Lard with Water
Beam Engines
Dispatch from Assistant Secretary Fox
The Size of Holes in Furnace Doors
A Gas Explosion
A Sensible New Year's Gift
Professor Grove on Light
Paper from Cane
Special Notice
Recent American Patent
Patent Claims
Departments
- Departments
Patents
Notes and Queries
