A live picture of a spinning globe had been shown before BBC programmes since the Sixties. When colour came to BBC 1, a curved mirror was added behind the globe, and the effect this produced continued to be seen on screen for over fifteen years. But technology had moved on and time was running out for this mechanical symbol.

A solid state device had generated the symbol on BBC 2 since the end of the Seventies. Subsequently, electronic clocks on both networks had replaced the mechanical clocks. And in early 1984, work began on a project to generate a digital symbol for BBC 1 too.

Special thanks to BBC Research & Development and Hywel Williams for supplying the images and much of the information used on this page.

Some of the images shown on this page contain graphics that are copyright of the BBC.