Here’s an interesting gadget for ghost hunters: the spirit typewriter. As related by Phantoms and Monsters, the spirit typewriter is a variation on the Ouija board designed to remove the possibility of human interference.
A ring of blank typewriter keys is placed above the arm mechanisms. The ring can spin freely, so the user doesn’t know which key imprints which letter on a paper tape. In theory, whatever messages a person is compelled to type out on this machine should be more believable than anything received via a traditional spirit board, the output of which could be a result of the ideomotor effect.
This channeling device reminds me of a character I came up with a couple years back, the ghost writer. Jenny’s automatic writing talent — or affliction, depending on your perspective — assumes she writes in longhand, but the spirit typewriter could be an interesting prop for her. Perhaps a team of paranormal investigators insists she use it to prove her talent is genuine; it would probably flummox any aspiring author from a premechanical era. Or maybe it’s the only way her talent works; that would make more sense in a context where it’s a boon, rather than a duty or intrusion on her life. If Jenny made her living selling dead people’s work, needing the typewriter to do it and overcoming its loss or damage would work for her needing a favor from intrepid occult experts.