Nature of the Earth's Interior
Its Relation to the Question of Deep Mining
Features
Apparatus to Illustrate Earth-Induction, and the Principle of the Simple Dynamo and Motor
Some Brilliant Examples of inefficiency
How to make a Shocking Coil
Simple Instructions for Amateurs
Steam Turbines.—I
Their Development during the Last Twenty-Five Years
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. †
Chinese Red Tuberoses
Antiquities in Magna Græcia
Live and Dead Weight
Traced Forgeries
Identity of Signatures as Proof of forgery
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
