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Scientific American Magazine Vol 40 Issue 20

Scientific American Magazine

Volume 40, Issue 20

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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

Daniel C. Beard

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