As for another viewer, this film was deposited in my memory banks a generation ago. This morning (4 Sept 2007) the TCM screen stirred that memory, so I taped and replayed the conclusion. The content is thin but the film is short, at least for a grown-up. Karloff is splendid, perfectly absorbed as ever in his character. His role is well supported by the evil medium-familiar woman with regulation severely-pulled-back hair. Dmytryk's touch is in evidence already, as every scene is well composed and lighted.
But the reason why the film stuck in my aging memory, and the only reason for it to attract attention, is the stunningly realized seance scenes at the end. As other posters have described, this isn't just any seance: most of the participants have already crossed over, but they look bewitchingly cool sheathed in deco metal suits. (Another poster called them diving suits, but more like space suits you'd find on the covers of Amazing Tales in that era.) In classic seance style, all these suited bodies are seated around a table.
As in Frankenstein and so many other movies since, the action in the lab scene mostly involves turning up the juice, which pours through the whole interlinked seance, adding a lot of hypnotic background noise. (And can be defended historically, since Spiritualists often used electro-magnetic metaphors to describe their rapport.)
What happens then testifies to a lesson later film-makers probably can't re-learn: nothing is more suggestive than restraint. In two concluding scenes where Karloff finally gets the experiment up and running the way he planned, this well-built seance scenario comes to partial but mesmerizing life. A spinning vortex appears at the bodies' center. The voice of Karloff's dead wife breaks through in a grinding electronica: "Julian!"
Then a lovely, unpredictable action: the seance cadavers in their space suits move ever so slightly, bowing toward the vortex in a series of click-actions. Then, when the electricity ceases, they click back into upright postures. Just as the Karloff character hears his wife's voice, something strangely suggestive of life beyond death occurs. The scene lasts only seconds but is repeated for the mob-finale. It's like an Eric Clapton solo, where you're touched less by what is actually played than all that might have been played. The performance stops at its peak moment, launching the audience's imagination in a way that extensions of the scene could never have accomplished.
