My original tumblr post was here. This image was originally posted by UDHCMH with the following explanatory text:

It’s Pulp Saturday!!!

This week: Science Fiction from June 1940.

Cover by Frank R. Paul, best known for his 1920s covers for Amazing and long-running life-on-other-worlds series for that magazine. He helped create much of the iconography of science fiction.

Hollywood could learn a lot from this pulp cover. We need more movies about heroes rescuing babes tied up on giant Bunsen burners at a congress of diaper-wearing, blond-bearded, cyclops frogs as volcanoes rumble in the distance. Now that’s entertainment!

That is indeed entertainment. The ISFDB entry for this issue is here. The image comes to us via Two-Fisted Pulp.