> With the DuMont Duoscopic, two different channels were broadcast on a single screen. To the naked eye, the images appeared superimposed on one another. But a

> With the DuMont Duoscopic, two different channels were broadcast on a single screen. To the naked eye, the images appeared superimposed on one another. But a viewer who wore polarized glasses or looked at the screen through a polarized panel saw just one of the images. So it would have been possible for two TV stations to team up and do a 3-D simulcast! And it was built in 1954, the same year that Hitchcock's 3-D movie "Dial M for Murder" came out! I highly doubt such a thing ever happened, but it would have been cool if it did.