Volume 110, Issue 7
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Features
More Information for the House Committee, Flying Around the World and more
The German Observatory in Spitzbergen, Watching the World Revolve
Curing Noise in a Concrete Building
Hitting the Bull's Eye at Six Miles
Target Practice in the United States Navy
Eliminating the Flicker From the Moving Picture
A New System of Motion Picture Projection
Where and How Radium is Obtained
The American Supply of the Most Precious Substance in the World