
The SciencesSeptember 1, 1937
Personalities in Science, September 1937

Personalities in Science, September 1937

Back of Frontispiece, February 1933

At the Rock Bottom of Matter
A Popular Explanation of a Much Discussed Theory Based on New Discoveries

Tungsten Lamps of High Efficiency—II
Nitrogen-Filled Lamps

Tungsten Lamps of High Efficiency—I
The Loss of Efficiency of Tungsten Lamps by Blackening of the Bulb, and Methods of Preventing It

A New Vacuum Gage of Extreme Sensitiveness