Mechanical idents or screen clocks were shown at major junctions between programmes and always before the news.
The first 91Èȱ¬ ident was introduced in 1953 in response to the impending launch of commercial television. The revolving black and white globe began life in 1963.
Colouring techniques were used to show it in blue and yellow after the advent of colour in 1967.
The globe remained a symbol for 91Èȱ¬ One until 2002 - its last incarnation was as a hot-air balloon.
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