Amazing Stories magazine, sometimes retitled Amazing Science Fiction, was first published in April 1926, thereby becoming the first magazine devoted exclusively to publishing stories in the genre presently known as science fiction (SF). It is regarded as the world's first science fiction magazine.
Created by Hugo Gernsback, with many of its covers by the legendary Frank R. Paul, it featured a much-imitated logo of the magazine name in ever-shrinking letters. Amazing Stories was filled with stories of "scientific romance". All totalled, his magazine covers exceed 220. Check out this website for a fairly comprehensive gallery of AS covers.
I flipping love the logo, if anyone knows anything about it get in touch please.