Volume 87, Issue 20
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Features
The Arnold System of Electrical Traction
Vocal Sounds of Fishes
A Punch Centering Device
Making a Photographic Lens
The Inclined Plane of the Morris Canal
Use of Photographs as Evidence
Acetylene Searchlights for Automobiles
The Improved Electrograph--A Fac-Simile Telegraph
Some Curious Homes
De Bradsky Airship Disaster
By the Paris Correspondent of the Scientific American