I’m always on the lookout for early depictions outside of sf with a climb-in-able time machine where you set the dials and go. Briefer’s humorous Frankenstein had just a such a machine in a 9-page story in issue 3 (Jul 1946). Frankenstein runs into Professor Goniph, and they travel in his machine to 2046 and 1646, although there is a twist at the end.