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The pips, as heard on Radio 4

The pips - the hourly sound marker broadcast on Radio 4, and other BBC stations - turn 90 on Wednesday.

First heard on 5 February 1924, the six beeps were devised by John Reith, head of the BBC, and Frank Watson Dyson, the Astronomer Royal, and controlled by two mechanical clocks at the Royal Greenwich Observatory - hence their official name: the Greenwich Time Signal.

Here are the pips, as heard across the BBC to this day.

  • 05 Feb 2014