Greenwich Time Signal
For 75 years the major global news headlines of the day have been preceded by
the six Greenwich Time 'pips'. When the news of Neil Armstrong's first
steps on the moon , President John F Kennedy's assassination and the destruction
of the Berlin Wall were broadcast across the world on the BBC, they followed the
familiar sound of the Greenwich pips.
On the 75th anniversary of the first broadcast of the six-pip Greenwich Time
Signal by the BBC, the Royal Observatory displayed for the first time in
public, the time pieces which produced the six pips for their first broadcast in
1924. The 1874 Dent regulators have recently returned to Greenwich
following the closure of the Royal Greenwich Observatory at Cambridge.
The six-pip Time Signal was introduced following the successful broadcast of
the chimes of Big Ben to usher in the New Year of 1924. Late in 1923,
Frank Dyson, ninth Astronomer Royal, visited John Reith, Director General of the
BBC, to discuss the idea of public time signals being broadcast. The
six-pip Time Signal (pips for seconds 55,56,57,58,59,00) was Dyson's brainchild,
devised in discussion with Frank Hope-Jones, inventor of the free pendulum
clock, who had originally advocated a five-pip signal. The sixth pip
signals the start of the next minute.
In 1939, the six pip signal and the Time Service moved from Greenwich to the
magnetic observatory at Abinger in Surrey. They then moved to
Herstmonceux, Sussex in 1957. In 1990, the Greenwich Time Service transmitted
its last pips. Since then the BBC has originated its own pips based on
signals from the GPS satellite network and from the 60kHz radio transmitter at
Rugby, operated by BT Aeronautical and Maritime under contract to the National
Jonathan Betts, Curator of Horology at the Royal Observatory, said "It
is entirely fitting that we display the timepieces which spread GMT and the
famous 'pips' across the world at a point in history when time is on everyone's
minds. We are pleased to give recognition to the work of Sir Frank Dyson
and to commemorate the historic link between the Observatory and the BBC."