My original tumblr post was here. This image was first blogged on tumblr by magictransistor, who identifies it as “Frank R. Paul, Planet Of The Knob Heads (Stanton A. Coblentz), Science Fiction, 1939.”
Tumblr favorite #2318: Robot aggressor III
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“Science Fiction” was the name of the magazine. The issue was December 1939.
http://www.philsp.com/data/images/s/science_fiction_193912.jpg