Volume 131, Issue 6
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Features
Scientific Tests for Good and Bad Singers
A Description of New Research on Methods of Determining the Characteristics and Possible Development of Singers Voices
Experiences Which I Cannot Explain Away
Are the Observations of This Noted Investigator Explainable by Mental Telepathy?
How Important is the Discovery of the Lost City of Leptis Magna?
An Editorial and Two Announcements, December 1924
Why We Are Trying to Make Gold
Our Radio Page, December 1924
Listening-In on the Latest Progress of the Broadcasting Art
Radio Vacuum Tubes that You Can Take Apart
A Costly Dump Heap
The Latest Developments in Bank Burglary
New Scientific Devices Used by Burglars and How the Bankers Meet Them
Is the End of Our Power Resources in Sight?
New Facts About This Momentous Question Were Gathered at the Recent World Power Conference
This Great Tunnel, Forty-four Feet in Diameter, Will be the Largest in Existence
The Story of Steel--XI
The Manufacture of Butt-Welded and Lap-Welded Steel Pipe
Is Time the Fourth Dimension?
The Basis of Aquatic Life
Some Significant Phases in the Study of the Plankton of Lakes and Seas, and What They Mean to Us