Solar Radiation
New Evidence on the Intensity of Radiation Outside the Atmosphere
Features
Testing Insulating Materials
A New Mastodon
Aerial Warfare and the Weather
Conditions that Affect Various Classes of Aircraft
New Aerodynamical Researches
Results of Many Important Experiments
Chemical Changes in Geotropism
Manufacture of Coal-Tar “Crudes”
Dynamiting a Derelict
Removing a Wreck on the Great Lakes from the Cource of Navigation
Munition Metals
Some of the Numerous Materials Required for Military Purposes
Dissipating Fog by Electricity
The Mushroom Lorelei and its Dangers
Electrical Precipitation of Suspended Matter
Electricity in Agriculture—I
Advantages that Make it a Necessity on a Modern Farm
Making Good Photographs
Practical Suggestions for Producing Useful Pictures
War Geology
Alcohol for Industrial Purposes
The Rifle and its Bullet
A Short History of Firearms and the Bullets they Use
Submarine Periscopes
The Principles of Construction in Various Types of Instruments
Protecting Congested Districts in Cities
Causes of Conflagrations, and Methods by which they Can be Prevented
