Volume 87, Issue 21
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Features
A Result of Improved Rapid Transit
The New American Lighthouse System
Pipe Galleries for the Broadway Tunnel
The Physiology of Certain Colors
Two New Warships for Chile
Horseshoer's Box
An Automobile Ambulance
A New Soot-Proof Spark Plug for Gasoline Motors
Revolving Chimney Cap
Popp-Branly Aerial Telegraphy Systems
By the Paris Correspondent of the Scientific American