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Features

Co-Ordinating our Waterways, The Mystery Towers Explained and more

Putting Waste Metals to Work

Methods and Machines That Make It Profitable for Every Plant to Handle Its Own Junk

By Robert G. Skerrett

The Fragrant Weed

Some Interesting Details in the Art of Tobacco Culture as Practiced in This Country

By William Henry

The Truth About the Dye Industry

Its Achievements and Its Status, and What Its Continuation Means to America

By H. Gardner McKerrow

Einstein's Theories of Relativity and Gravitation

The Book in Which Is Collected the Material Brought Out by the $5,000 Prize Contest

The Giant of the Skies

The Size and Distance of Betelguese, and a Few Other Items of the Astronomer&s Daily Business

Radio with the Arc Transmitter

The Remarkable Showing Made by This Type of Apparatus on the Aeolus

By Arthur H. Lynch

A Super-Dreadnaught as Target

The Latest German Battleship Baden Sunk by Gunfire and Torpedo

By Hector C. Bywater

The Effect of Weight or Pressure

Departments

  • Departments

    The Motor-Driven Commercial Vehicle

  • Recently Patented Inventions

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May 1921

Think Outside the Gift Box