Features
Cobalt--Its Properties and Uses
Platinized Looking-Glasses
A Plea for Our "Dumb" Slaves
The Pneumatic Tunnel Under Broadway, N. Y.
Hubbell & Capron's Improved Turbine Wheel
Universal Balance for Millstones
The Cultivation of Timber
The Law of "Vis Viva"
What Oysters Eat
A Plea for the Society for the Prevention of Cruelty to Animals
The New Explosive Dualin
Systematic Thinking
Mr. Rutherfurd's Star Photographs
Concerning Patent Office Matters
The Lightest Machine
Tyndall on Haze and Dust
Answers to Correspondents- March 5, 1870
The Zircon Light
Recent American and Foreign Patents- March 5, 1870
Official List of Patents- March 5, 1870
Applications for Extension of Patents- March 5, 1870
Departments
- Letters
Correspondence- March 5, 1870
- Recommended
New Books and Publications- March 5, 1870
- Departments
Business and Personal- March 5, 1870
