Because instead of a CRT and its associated electronics, they featured a spinning disk with a spiral pattern of holes. These mechanical TV systems were quickly superseded in the 1930s by all ...

Before that we’d have had a CRT colour TV, them maybe our parents grew up ... which were mechanical devices that relied on a spinning disk to both acquire and display the image.

TV Answer Man, I like streaming because it has so much programming and you can choose which services to get so you can keep ...