Will Humanity Annihilate Itself? (1939)
The March 29, 1939 San Antonio Light (San Antonio, TX) ran this teaser for an article that was to appear in the April 2nd issue of The American Weekly.
At first glance, I had assumed that the ad was referencing this article that we looked at from 1935, but upon closer inspection it would seem they simply used the same drawing of a robot soldier from Erik Nitsche. Maybe if I track down the actual 1939 article from Professor C.M. Joad I'll straighten this whole robotic mess out. Until then, enjoy the pictures (...of an uber-dystopian, sentient robot hellscape!)