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Features

Electrical Illumination at the Pan-American Exposition

By Edward Hale Brush

The Telegraphone—A Magnetic Speech Recorder

By Valdemar Poulsen

Contemporary Electrical Science

The Treatment of London Sewage

Intensive Lighting with Kerosene

Express Compound Locomotive, Southern Railway of Italy

The Geological Society of America

By Edmund O. Hovey

An Australian Coal Mountain

The Polar Bear

The Cinematograph at the Exposition of Instruction

The Present Commercial Condition of Persia

The Pickerdike Canceling Apparatus

Recent Science

1. UNSUSPECTED RADIATIONS

Australian Leather

The Steam Turbine: The Steam Engine of Maximum Simplicity and of Highest Thermal Efficiency

By Robert H. Thurston

Poisonous Glazed Wares

Trade Suggestions from United States Consuls

Patents!

Trade Notes and Receipts

Departments

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    January 19, 1901

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