Despite the title, the series is actually sci-fi about a time traveler and his machine...
...who occasionally run into mystical menaces.
IIRC, The Time Tunnel TV series did the same thing, encountering Merlin, the ghost of Nero, and others along with the usual silver-skinned Irwin Allen aliens...
This series started in Jumbo Comics #1 (1939) as Diary of Dr Hayward, illustrated by Jack Kirby under the house pseudonom "Curt Davis" (which was used for every story in the series).
With #5, Lou Fine assumed the art chores, and several issues later the title changed to Weird Stories of the Supernatural as lab assistant Stuart Taylor took center stage and old Doc Hayward became a supporting character.
(In fact, the series title sometimes listed "Stuart Taylor" above the "Weird Stories..." logo, playing up the action-hero aspect.)
As of 15, a rotating lineup of artists contributed art but no other "big names" worked on the series which continued for almost the entire run of Jumbo, ending at #140 (1950).
You'll be seeing more of this multi-titled series here, so bookmark us for a daily dose of classic comics fun!