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miniman-they matted out the screen, which was the standard practice for many years. Between flicker from the screen and the typically low film ASA, filming straight from the screen was a poor choice. It's not until the 80s that you see things like flicker-free screen filming (I think you know what I'm trying to express). In which case, they have managed to sync the camera shutter to the refresh rate of the screen. There is more to this subject, a lot more, but those are the basics of what we are seeing in this movie.
Why a test jig? Probably lighter. No chassis, and the picture tube was probably removed and a piece of color-keyed cardboard stuck in its place.
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