Thanks. That does seem to confirm that 120 and 240 did once share a configuration.
Steve,
I couldn't find anything on the NEMA site, but interesting nonetheless.
The part of the film where this happens is in a radio studio rather than a home, so I would guess the presence of 220V wouldn't be uncommon. Whether it would have been usual to have both AC and DC supplies at that time, I wouldn't know -- Maybe that part was Hollywood just emphasizing the difference.
