Scientific American Magazine
Volume 40, Issue 20You are currently logged out. Please sign in to download the issue PDF.
Features
A New Estimate of the World's Age
When are Laws Discovered?
The Longest Tunnel in the World
The Power of Vibration Harnessed
American Industries.--No. 12
Edison's Electric Illuminator and Dr. Draper's Experiments Thirty Years Ago
Molecular Chemistry.--No. 1
Testing Lubricants
A Few Novelties
New Agricultural Inventions - May 17, 1879
The Detroit River Tunnel and Bridge
Disinfection
The Patentees' Protective Association
Improved Paper Cutting and Winding Machine
New Cut-Off for Steam Engines
The Kanchil, or Pygmy Musk
Recent Mechanical Inventions - May 17, 1879
Natural History Notes
The Calamar
To Inventors - May 17, 1879
Communications Received - May 17, 1879
Departments
New Books and Publications - May 17, 1879
Business and Personal - May 17, 1879
Notes and Queries - May 17, 1879
Index of Inventions - May 17, 1879
Patents - May 17, 1879
