Mining Gold by Proxy
The Old-Fashioned Miner Replaced by Machinery
Volume 75, Issue 1951supp
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Features
Report on the Condition of Aeronautics in Germany
Extracts from a Report by the American Consul-General, Berlin, April 4th, 1913
Human and other Population of the United States
The Increased Cost of Warships
Floral Blue
Pork Production
The Pendulum Propeller Rudder
An Oscillating Substitute for the Screw
High-Frequency Generator
For Wireless Telegraphy and Telephony
Classification of Igneous Rocks
Rat-proof Buildings
The Lava Fountains of Kilauea
Observations by Telephotography
Propagation of High-Frequency Electric Waves along Wires—II
Advantages and Limitations of the System for Practical Operation