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Features

The Power Plants of the Pacific Coast

By F. A. C. Perrine

Problems of Electric Railways

Constant-Current Rapid Urban Train

By J. Swinburne and W. R. Cooper

A Study of Growing Crystals by Instantaneous Photomicrography

By Theodore William Richards and Ebenezer Henry Archibald

On the Radio-Activity of Matter

By Henri Becquerel

A Balloon Trip over the Alps

New French Dredges

A Marvelous Clock

Photographic Plates

Recent Scientific Developments and the Future of Naval Warfare

By William Laird Clowes

Torpedo Boat Destroyers

By S. W. Barnaby

Motocycles in 1902

Commerce between the United States and Porto Rico

Dublin's New Central Station and Fire Escape

A New Shaving Paste

The Artificial Production of Precious Metals

Roentgen Rays in Diagnosis

Scales of Denominate Units

By Kelly Miller

Trade Suggestions from United States Consuls

Patents!

Selected Formulæ

Departments

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