Volume 124, Issue 24
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Features
Putting Motion into Mechanical Drawings
How Motion Picture Films of Hidden Mechanisms Are Made for Industrial and Educational Purposes
Counting Electrons
Diagnosis by Wireless
Below Zero
The Low Temperature Laboratory of the United States Bureau of Mines
An Alternative to Einstein
How Dr. Poor Would Save Newton's Law and the Classical Time and Space Concepts
New Sources of Pulp and Paper
The Direction in Which the Paper Maker Will Turn When His Timber Supply Is Gone
Sixty Tons Per Minute
Baltimore's New Coal Pier, and How It Makes Its Records