Features
Tunnel Tubes in Soft Material
The Problem of Raising an Existing Dam Structure
The Shackleton Antarctic Expedition
Government Tests of Safety Devices for Mines
The Largest Arch Bridge in the World
The Two Competitors in the Motor Boat Race to Bermuda
Mining in Newfoundland
Teaching Deaf-Mutes to Speak
Nature's Touch-Me-Nots
Combined Lightning Arrester, Fuse Box, and Insulator
A New Method of Handling Acids
A Novel Sash Lock
Improved Grass Cutter
Departments
- Departments
Correspondence
Notes and Queries
Recently Patented Inventions
Index of Inventions
New Books, Etc.
Patents
