Volume 51, Issue 1307supp
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Features
The Telegraphone—A Magnetic Speech Recorder
Contemporary Electrical Science
The Treatment of London Sewage
Intensive Lighting with Kerosene
Express Compound Locomotive, Southern Railway of Italy
The Geological Society of America
The Polar Bear
An Australian Coal Mountain
The Pickerdike Canceling Apparatus
The Present Commercial Condition of Persia
The Cinematograph at the Exposition of Instruction
Recent Science
1. UNSUSPECTED RADIATIONS