Nature of the Earth's Interior
Its Relation to the Question of Deep Mining
Volume 70, Issue 1806supp
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Features
Apparatus to Illustrate Earth-Induction, and the Principle of the Simple Dynamo and Motor
How to make a Shocking Coil
Simple Instructions for Amateurs
Some Brilliant Examples of inefficiency
Steam Turbines.—I
Their Development during the Last Twenty-Five Years
Influence of Thunder upon Raindrops
The Rio Grande Irrigation Project
The Largest Reservoir in the World
Air Nitrate Fertilizers
New Monorail Cars
Recent Progress in Aviation.—IV
Chronology of Aviation. †
Chinese Red Tuberoses
Live and Dead Weight
Antiquities in Magna Græcia
Traced Forgeries
Identity of Signatures as Proof of forgery
Improved Open Feed-Water Heater
An Early Electric Fire Pump
Light and Electromagnetism
Electric Waves and the Electromagnetic Theory of Light
Amateurs and Astronomical Discovery
How Amateurs can Help Astronomers