Volume 109, Issue 7
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Features
Cathode Rays from Incandescent Lamps, New Kerosene Vaporizer Demonstrated and more
By Our Berlin Correspondent
An Integrating Opacimeter for Stellar Photography
The Prototype of the Yale Lock
Comparison of French and German Strength in Dirigible Airships
Why Germany is the Leading Air Power
The Japanese Battle-cruiser "Kongo"
The Most Powerful Armored Cruiser Afloat