By David Wright O'Brien (1918-44).
First appearance: Amazing Stories, July 1941.
Reprinted in Amazing Stories Quarterly, Winter 1941.
Short short story (8 pages as a PDF).
Online at Roy Glashan's Library (HERE: HTML and HERE: EPUB) and Archive.org (HERE).
(Parental caution: Some strong language.)
"Keep your bungling paws off that machine!"It's like what that guy in a movie once said: "Don't fool around with something when you don't know what it is."
- If he hadn't been killed in combat, David Wright O'Brien would have been a major voice in SFF in the post-war era.
and (HERE), the SFE (HERE), the Edge interview with physicist Paul Davies (HERE),
and (we couldn't resist) TV Tropes (HERE).