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Features

Quilled Animals

Synthetic Rubber

The Crystalline Structure of Iron at High Temperatures

The India-Rubber Industry.—II

Past, Present, and Future

By Philip Schidrowitz

The Place De L'Opera Station

A Complex Engineering Feat on the Paris Metropolitan

By Lucien Fournier

Reversing Motors

Some Much-Needed Data

By J. S. McKee

The Electrification of Railways.—II

An Imperative: Need for the Selection of a System for Universal Use

By George Westinghouse

Turbines and Propellers

Rays of Positive Electricity

Useful Shipyard Machine

Universal Shear for Channels, Angles, and Plates

A New System of Wireless Telegraphy

The Belli Nl-Tosi Apparatus

The Light of the Firefly

Luminosity Without Heat

By H. E. Ives and W. W. Coblentz

Mining Coal with Explosives

Suggestions for the Miner

By C. E. Munroe and Clarence Hall

Numbering the Stars

The Astrographic Chart and Catalogue

By F. W. Henkel

A Commercial Fuel Briquetting Plant

Electrical Notes

Engineering Notes

Science Notes

Departments

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July 16, 1910

Think Outside the Gift Box