Volume 124, Issue 21
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Features
Putting Waste Metals to Work
Methods and Machines That Make It Profitable for Every Plant to Handle Its Own Junk
The Fragrant Weed
Some Interesting Details in the Art of Tobacco Culture as Practiced in This Country
The Truth About the Dye Industry
Its Achievements and Its Status, and What Its Continuation Means to America
The Giant of the Skies
The Size and Distance of Betelguese, and a Few Other Items of the Astronomer&s Daily Business
Einstein's Theories of Relativity and Gravitation
The Book in Which Is Collected the Material Brought Out by the $5,000 Prize Contest
Radio with the Arc Transmitter
The Remarkable Showing Made by This Type of Apparatus on the Aeolus
A Super-Dreadnaught as Target
The Latest German Battleship Baden Sunk by Gunfire and Torpedo