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Nature of the Earth's Interior

Its Relation to the Question of Deep Mining

By E. H. L. Schwarz

Apparatus to Illustrate Earth-Induction, and the Principle of the Simple Dynamo and Motor

By Henry S. Curtis

Some Brilliant Examples of inefficiency

By Harrington Emerson

How to make a Shocking Coil

Simple Instructions for Amateurs

Steam Turbines.—I

Their Development during the Last Twenty-Five Years

By Gerald Stoney

Influence of Thunder upon Raindrops

Air Nitrate Fertilizers

The Rio Grande Irrigation Project

The Largest Reservoir in the World

New Monorail Cars

Recent Progress in Aviation.—IV

Chronology of Aviation. †

By O. Chanute

Chinese Red Tuberoses

Antiquities in Magna Græcia

Live and Dead Weight

Traced Forgeries

Identity of Signatures as Proof of forgery

By Albert S. Osborn

An Early Electric Fire Pump

Improved Open Feed-Water Heater

Light and Electromagnetism

Electric Waves and the Electromagnetic Theory of Light

Amateurs and Astronomical Discovery

How Amateurs can Help Astronomers

By W. F. Denning

Trade Notes and Formulæ

Science Notes

Engineering Notes


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