Clock Tower, Palace of Westminster
Encyclopedia
Big Ben is the nickname for the great bell
Bell (instrument)
A bell is a simple sound-making device. The bell is a percussion instrument and an idiophone. Its form is usually a hollow, cup-shaped object, which resonates upon being struck...

 of the clock
Clock
A clock is an instrument used to indicate, keep, and co-ordinate time. The word clock is derived ultimately from the Celtic words clagan and clocca meaning "bell". A silent instrument missing such a mechanism has traditionally been known as a timepiece...

 at the north end of the Palace of Westminster
Palace of Westminster
The Palace of Westminster, also known as the Houses of Parliament or Westminster Palace, is the meeting place of the two houses of the Parliament of the United Kingdom—the House of Lords and the House of Commons...

 in London
London
London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

, and is generally extended to refer to the clock or the clock tower
Clock tower
A clock tower is a tower specifically built with one or more clock faces. Clock towers can be either freestanding or part of a church or municipal building such as a town hall. Some clock towers are not true clock towers having had their clock faces added to an already existing building...

 as well. It is the largest four-faced chiming
Chime (bell instrument)
A carillon-like instrument with fewer than 23 bells is called a chime.American chimes usually have one to one and a half diatonic octaves. Many chimes play an automated piece of music. Prior to 1900, chime bells typically lacked dynamic variation and the inner tuning required to permit the use of...

 clock and the third-tallest free-standing clock tower in the world. It celebrated its 150th anniversary on 31 May 2009, during which celebratory events took place. The erecting of the tower was completed on 10 April 1858. The clock tower has become one of the most prominent symbols of both London and England, often in the establishing shot
Establishing shot
An establishing shot in filmmaking and television production sets up, or establishes the context for a scene by showing the relationship between its important figures and objects...

 of films set in the city.

Tower

The present Clock Tower was raised as a part of Charles Barry
Charles Barry
Sir Charles Barry FRS was an English architect, best known for his role in the rebuilding of the Palace of Westminster in London during the mid-19th century, but also responsible for numerous other buildings and gardens.- Background and training :Born on 23 May 1795 in Bridge Street, Westminster...

's design for a new palace, after the old Palace of Westminster was largely destroyed by fire on the night of 16 October 1834. The new Parliament was built in a Neo-gothic style. Although Barry was the chief architect of the Palace, he turned to Augustus Pugin for the design of the Clock Tower, which resembles earlier Pugin designs, including one for Scarisbrick Hall
Scarisbrick Hall
Scarisbrick Hall is a country house situated just to the south-east of the village of Scarisbrick in Lancashire, England.-History:Scarisbrick Hall was the ancestral home of the Scarisbrick family and dates back to the time of King Stephen . The Scarisbrick family lived on the site from 1238 until...

. The design for the Clock Tower was Pugin's last design before his final descent into madness and death, and Pugin himself wrote, at the time of Barry's last visit to him to collect the drawings: "I never worked so hard in my life for Mr Barry for tomorrow I render all the designs for finishing his bell tower & it is beautiful." The tower is designed in Pugin's celebrated Gothic Revival
Gothic Revival architecture
The Gothic Revival is an architectural movement that began in the 1740s in England...

 style, and is 96.3 metres (315.9 ft) high (roughly 16 stories).

The bottom 61 metres (200.1 ft) of the Clock Tower's structure consists of brickwork with sand coloured Anston
Anston
The villages of North Anston and South Anston are the principal constituents of the civil parish of North and South Anston, in the Metropolitan Borough of Rotherham in South Yorkshire, England...

 limestone cladding
Cladding (construction)
Cladding is the application of one material over another to provide a skin or layer intended to control the infiltration of weather elements, or for aesthetic purposes....

. The remainder of the tower's height is a framed spire of cast iron
Cast iron
Cast iron is derived from pig iron, and while it usually refers to gray iron, it also identifies a large group of ferrous alloys which solidify with a eutectic. The color of a fractured surface can be used to identify an alloy. White cast iron is named after its white surface when fractured, due...

. The tower is founded on a 15 metres (49.2 ft) square raft, made of 3 metres (9.8 ft) thick concrete, at a depth of 4 metres (13.1 ft) below ground level. The four clock dials are 55 metres (180.4 ft) above ground. The interior volume of the tower is 4,650 cubic metres (164,200 cubic feet).

Despite being one of the world's most famous tourist attractions, the interior of the tower is not open to overseas visitors, though United Kingdom residents are able to arrange tours (well in advance) through their Member of Parliament. However, the tower has no lift, so those escorted must climb the 334 limestone stairs to the top.

Because of changes in ground conditions since construction (notably tunnelling for the Jubilee Line
Jubilee Line
The Jubilee line is a line on the London Underground , in the United Kingdom. It was built in two major sections—initially to Charing Cross, in central London, and later extended, in 1999, to Stratford, in east London. The later stations are larger and have special safety features, both aspects...

 extension), the tower leans slightly to the north-west, by roughly 220 millimetres (8.66 in) at the clock dials, giving an inclination of approximately 1/250. Due to thermal effects it oscillates annually by a few millimetres east and west.

Dials

The clock dials are big enough that the Clock Tower was once the largest four-faced clock in the world.
The clock and dials were designed by Augustus Pugin
Augustus Pugin
Augustus Welby Northmore Pugin was an English architect, designer, and theorist of design, now best remembered for his work in the Gothic Revival style, particularly churches and the Palace of Westminster. Pugin was the father of E. W...

. The clock dials are set in an iron frame 7 metres (23 ft) in diameter, supporting 312 pieces of opal glass, rather like a stained-glass
Stained glass
The term stained glass can refer to coloured glass as a material or to works produced from it. Throughout its thousand-year history, the term has been applied almost exclusively to the windows of churches and other significant buildings...

 window. Some of the glass pieces may be removed for inspection of the hands. The surround of the dials is gilded
Gilding
The term gilding covers a number of decorative techniques for applying fine gold leaf or powder to solid surfaces such as wood, stone, or metal to give a thin coating of gold. A gilded object is described as "gilt"...

. At the base of each clock dial in gilt letters is the Latin
Latin
Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

 inscription:
Which means O Lord, keep safe our Queen Victoria the First.

Movement

The clock's movement
Movement (clockwork)
In horology, a movement is the internal mechanism of a clock or watch, as opposed to the case, which encloses and protects the movement, and the face which displays the time. The term originated with mechanical timepieces, whose movements are made of many moving parts...

 is famous for its reliability. The designers were the lawyer and amateur horologist
Horology
Horology is the art or science of measuring time. Clocks, watches, clockwork, sundials, clepsydras, timers, time recorders and marine chronometers are all examples of instruments used to measure time.People interested in horology are called horologists...

 Edmund Beckett Denison
Edmund Beckett, 1st Baron Grimthorpe
Edmund Beckett, 1st Baron Grimthorpe, Q.C. , known previously as Sir Edmund Beckett, 5th Baronet and Edmund Beckett Denison was a lawyer, horologist, and architect...

, and George Airy
George Biddell Airy
Sir George Biddell Airy PRS KCB was an English mathematician and astronomer, Astronomer Royal from 1835 to 1881...

, the Astronomer Royal
Astronomer Royal
Astronomer Royal is a senior post in the Royal Household of the Sovereign of the United Kingdom. There are two officers, the senior being the Astronomer Royal dating from 22 June 1675; the second is the Astronomer Royal for Scotland dating from 1834....

. Construction was entrusted to clockmaker Edward John Dent
Edward John Dent
Edward John Dent was a famous English watchmaker noted for his highly accurate clocks and marine chronometers.He founded the Dent company.- Early years :...

; after his death in 1853 his stepson Frederick Dent completed the work, in 1854. As the Tower was not complete until 1859, Denison had time to experiment: Instead of using the deadbeat escapement and remontoire
Remontoire
In mechanical horology, a remontoire, is a small secondary source of power, a weight or spring, which runs the timekeeping mechanism and is itself periodically rewound by the timepiece's main power source, such as a mainspring...

 as originally designed, Denison invented the double three-legged gravity escapement. This escapement
Escapement
In mechanical watches and clocks, an escapement is a device that transfers energy to the timekeeping element and enables counting the number of oscillations of the timekeeping element...

 provides the best separation between pendulum
Pendulum
A pendulum is a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced from its resting equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position...

 and clock mechanism. The pendulum is installed within an enclosed windproof box sunk beneath the clockroom. It is 3.9m long, weighs 300 kg and beats every 2 seconds. The clockwork mechanism in a room below weighs 5 tons.
On top of the pendulum is a small stack of old penny coins
British One Penny coin (pre-decimal)
The English Penny, originally a coin of 1.3 to 1.5 g pure silver, includes the penny introduced around the year 785 by King Offa of Mercia. However, his coins were similar in size and weight to the continental deniers of the period, and to the Anglo-Saxon sceats which had gone before it, which were...

; these are to adjust the time of the clock. Adding a coin has the effect of minutely lifting the position of the pendulum's centre of mass
Center of mass
In physics, the center of mass or barycenter of a system is the average location of all of its mass. In the case of a rigid body, the position of the center of mass is fixed in relation to the body...

, reducing the effective length of the pendulum rod and hence increasing the rate at which the pendulum swings. Adding or removing a penny will change the clock's speed by 0.4 seconds per day.

On 10 May 1941, a German bombing raid damaged two of the clock's dials and sections of the tower's stepped roof and destroyed the House of Commons chamber. Architect Sir Giles Gilbert Scott designed a new five-floor block. Two floors are occupied by the current chamber which was used for the first time on 26 October 1950. Despite the heavy bombing the clock ran accurately and chimed throughout the Blitz
The Blitz
The Blitz was the sustained strategic bombing of Britain by Nazi Germany between 7 September 1940 and 10 May 1941, during the Second World War. The city of London was bombed by the Luftwaffe for 76 consecutive nights and many towns and cities across the country followed...

.
The Big Ben clock tower has been tilting as a result of the excavation of tunnels near Westminster. The tower has tilted an additional 0.9 mm each year since 2003, and the tilt can now be seen by the naked eye.

Malfunctions, breakdowns, and other outages

  • 1916: for two years during World War I
    World War I
    World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

    , the bells were silenced and the clock face darkened at night to prevent attack by German Zeppelin
    Zeppelin
    A Zeppelin is a type of rigid airship pioneered by the German Count Ferdinand von Zeppelin in the early 20th century. It was based on designs he had outlined in 1874 and detailed in 1893. His plans were reviewed by committee in 1894 and patented in the United States on 14 March 1899...

    s.
  • 1 Sept. 1939: although the bells continued to ring, the clock faces were darkened at night through World War II
    World War II
    World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

     to prevent guiding Blitz
    The Blitz
    The Blitz was the sustained strategic bombing of Britain by Nazi Germany between 7 September 1940 and 10 May 1941, during the Second World War. The city of London was bombed by the Luftwaffe for 76 consecutive nights and many towns and cities across the country followed...

     pilots.
  • New Year's Eve 1962: The clock slowed due to heavy snow and ice on the long hands, causing the pendulum to detach from the clockwork, as it is designed to do in such circumstances, to avoid serious damage elsewhere in the mechanism—the pendulum continuing to swing freely. Thus it chimed in the new year 10 minutes late.
  • 5 August 1976: First and only major breakdown. The air brake speed regulator of the chiming mechanism broke after more than 100 years of torsional fatigue causing the fully wound 4 ton weight to spin the winding drum out of the movement, causing a large amount of damage. The Great Clock was shut down for a total of 26 days over nine months – it was reactivated on 9 May 1977; this was its longest break in operation since it was built. During this time BBC Radio 4
    BBC Radio 4
    BBC Radio 4 is a British domestic radio station, operated and owned by the BBC, that broadcasts a wide variety of spoken-word programmes, including news, drama, comedy, science and history. It replaced the BBC Home Service in 1967. The station controller is currently Gwyneth Williams, and the...

     had to make do with the pips
    Greenwich Time Signal
    The Greenwich Time Signal , popularly known as the pips, is a series of six short tones broadcast at one-second intervals by many BBC Radio stations to mark the precise start of each hour...

    . Although there were minor stoppages from 1977 to 2002 when the maintenance of the clock was carried out by the old firm of clockmakers Thwaites & Reed, these were often repaired within the permitted two hour downtime and not recorded as stoppages. Prior to 1970 the maintenance was carried out by the original firm of Dents and since 2002 by Parliamentary staff.
  • 27 May 2005: the clock stopped at 10:07 pm local time, possibly due to hot weather; temperatures in London had reached an unseasonable 31.8 °C (90 °F). It restarted, but stopped again at 10:20 pm local time and remained still for about 90 minutes before restarting.
  • 29 October 2005: the mechanism was stopped for about 33 hours so the clock and its chimes could be worked on. It was the lengthiest maintenance shutdown in 22 years.
  • 7:00 am 5 June 2006: The clock tower's "Quarter Bells" were taken out of commission for four weeks as a bearing holding one of the quarter bells was damaged from years of wear and needed to be removed for repairs. During this period, BBC Radio 4 broadcast recordings of British bird song
    Bird song
    Bird vocalization includes both bird calls and bird songs. In non-technical use, bird songs are the bird sounds that are melodious to the human ear. In ornithology and birding, songs are distinguished by function from calls.-Definition:The distinction between songs and calls is based upon...

     followed by the pips in place of the usual chimes.
  • 11 August 2007: Start of 6-week stoppage for maintenance. Bearings in the clock's going train and the "great bell" striker were replaced, for the first time since installation. During the maintenance works, the clock was not driven by the original mechanism, but by an electric motor
    Electric motor
    An electric motor converts electrical energy into mechanical energy.Most electric motors operate through the interaction of magnetic fields and current-carrying conductors to generate force...

    . Once again, BBC Radio 4
    BBC Radio 4
    BBC Radio 4 is a British domestic radio station, operated and owned by the BBC, that broadcasts a wide variety of spoken-word programmes, including news, drama, comedy, science and history. It replaced the BBC Home Service in 1967. The station controller is currently Gwyneth Williams, and the...

     had to make do with the pips during this time.

Great Bell

The main bell, officially known as the Great Bell, is the largest bell in the tower and part of the Great Clock of Westminster. The bell is better known by the nickname Big Ben.

The original bell was a 16.3-tonne
Tonne
The tonne, known as the metric ton in the US , often put pleonastically as "metric tonne" to avoid confusion with ton, is a metric system unit of mass equal to 1000 kilograms. The tonne is not an International System of Units unit, but is accepted for use with the SI...

 (16 ton
Long ton
Long ton is the name for the unit called the "ton" in the avoirdupois or Imperial system of measurements, as used in the United Kingdom and several other Commonwealth countries. It has been mostly replaced by the tonne, and in the United States by the short ton...

) hour bell, cast on 6 August 1856 in Stockton-on-Tees
Stockton-on-Tees
Stockton-on-Tees is a market town in north east England. It is the major settlement in the unitary authority and borough of Stockton-on-Tees. For ceremonial purposes, the borough is split between County Durham and North Yorkshire as it also incorporates a number of smaller towns including...

 by John Warner & Sons
John Warner & Sons
John Warner and Sons was a Bellfoundry in various locations in London, UK.-Notable Bells:Warners cast some notable bells including the clock chime at the Houses of Parliament, although Big Ben was later re-cast by the Whitechapel Bell Foundry. In 1913, Warners cast the peal of 12 bells at...

. The bell was named in honour of Sir Benjamin Hall
Benjamin Hall, 1st Baron Llanover
Benjamin Hall, 1st Baron Llanover PC , known as Sir Benjamin Hall, Bt, between 1838 and 1859, was a British civil engineer and politician.-Political career:...

, and his name is inscribed on it. However, another theory for the origin of the name is that the bell may have been named after a contemporary heavyweight boxer Benjamin Caunt
Ben Caunt
Ben Caunt was a 19th century English bare-knuckle boxer who became the "heavyweight" boxing champion known as the "Torkard Giant" and "Big Ben".-Early life:...

. It is thought that the bell was originally to be called Victoria or Royal Victoria in honour of Queen Victoria
Victoria of the United Kingdom
Victoria was the monarch of the United Kingdom of Great Britain and Ireland from 20 June 1837 until her death. From 1 May 1876, she used the additional title of Empress of India....

, but that an MP suggested the nickname during a Parliamentary debate; the comment is not recorded in Hansard
Hansard
Hansard is the name of the printed transcripts of parliamentary debates in the Westminster system of government. It is named after Thomas Curson Hansard, an early printer and publisher of these transcripts.-Origins:...

.

Since the tower was not yet finished, the bell was mounted in New Palace Yard. Cast in 1856, the first bell was transported to the tower on a trolley drawn by sixteen horses, with crowds cheering its progress. Unfortunately, it cracked beyond repair while being tested and a replacement had to be made. The bell was recast at the Whitechapel Bell Foundry
Whitechapel Bell Foundry
The Whitechapel Bell Foundry is a bell foundry in Whitechapel in the London Borough of Tower Hamlets, in the East End of London. The foundry is listed by the Guinness Book of Records as the oldest manufacturing company in Great Britain...

 as a 13.76-tonne
Tonne
The tonne, known as the metric ton in the US , often put pleonastically as "metric tonne" to avoid confusion with ton, is a metric system unit of mass equal to 1000 kilograms. The tonne is not an International System of Units unit, but is accepted for use with the SI...

 (13½ ton
Long ton
Long ton is the name for the unit called the "ton" in the avoirdupois or Imperial system of measurements, as used in the United Kingdom and several other Commonwealth countries. It has been mostly replaced by the tonne, and in the United States by the short ton...

) bell. This was pulled 200 ft (61 m) up to the Clock Tower’s belfry, a feat that took 18 hours. It is 2.2 metres tall and 2.9 metres wide. This new bell first chimed in July 1859. In September it too cracked under the hammer, a mere two months after it officially went into service. According to the foundry's manager, George Mears, Denison had used a hammer more than twice the maximum weight specified. For three years Big Ben was taken out of commission and the hours were struck on the lowest of the quarter bells until it was reinstalled. To make the repair, a square piece of metal was chipped out from the rim around the crack, and the bell given an eighth of a turn so the new hammer struck in a different place. Big Ben has chimed with an odd twang ever since and is still in use today complete with the crack. At the time of its casting, Big Ben was the largest bell in the British Isles until "Great Paul", a 17 tonne (16¾ ton) bell currently hung in St Paul's Cathedral
St Paul's Cathedral
St Paul's Cathedral, London, is a Church of England cathedral and seat of the Bishop of London. Its dedication to Paul the Apostle dates back to the original church on this site, founded in AD 604. St Paul's sits at the top of Ludgate Hill, the highest point in the City of London, and is the mother...

, was cast in 1881.

Chimes

Along with the Great Bell, the belfry houses four quarter bells
Quarter bells
Quarter bells are the bells that the clock mechanism strikes on each passing quarter of the hour. Often, as in the case of Big Ben, a different tune is played for each quarter. This enables people to be able to tell the time, without actually having to be within sight of the clock face....

 which play the Westminster Quarters on the quarter hours. The four quarter bells are G, F, E, and B. They were cast by John Warner & Sons at their Crescent Foundry in 1857 (G, F and B) and 1858 (E). The Foundry was in Jewin Crescent, in what is now known as The Barbican, in the City of London.

The Quarter Bells play a 20-chime sequence, 1–4 at quarter past, 5–12 at half past, 13–20 and 1–4 at quarter to, and 5–20 on the hour (which sounds 25 seconds before the main bell tolls the hour). Because the low bell (B) is struck twice in quick succession, there is not enough time to pull a hammer back, and it is supplied with two wrench hammers on opposite sides of the bell. The tune is that of the Cambridge Chimes, first used for the chimes of Great St Mary's church, Cambridge
Cambridge
The city of Cambridge is a university town and the administrative centre of the county of Cambridgeshire, England. It lies in East Anglia about north of London. Cambridge is at the heart of the high-technology centre known as Silicon Fen – a play on Silicon Valley and the fens surrounding the...

, and supposedly a variation
Variation (music)
In music, variation is a formal technique where material is repeated in an altered form. The changes may involve harmony, melody, counterpoint, rhythm, timbre, orchestration or any combination of these.-Variation form:...

, attributed to William Crotch
William Crotch
William Crotch was an English composer, organist and artist.Born in Norwich to a master carpenter he showed early musical talent . The three and a half year old Master William Crotch was taken to London by his ambitious mother, where he not only played on the organ of the Chapel Royal in St....

, on a phrase
Phrase (music)
In music and music theory, phrase and phrasing are concepts and practices related to grouping consecutive melodic notes, both in their composition and performance...

 from Handel
George Frideric Handel
George Frideric Handel was a German-British Baroque composer, famous for his operas, oratorios, anthems and organ concertos. Handel was born in 1685, in a family indifferent to music...

's Messiah
Messiah (Handel)
Messiah is an English-language oratorio composed in 1741 by George Frideric Handel, with a scriptural text compiled by Charles Jennens from the King James Bible and the Book of Common Prayer. It was first performed in Dublin on 13 April 1742, and received its London premiere nearly a year later...

. The notional words of the chime, again derived from Great St Mary's and in turn an allusion to Psalm 37:23–24, are: "All through this hour/Lord be my guide/And by Thy power/No foot shall slide". They are written on a plaque on the wall of the clock room.

Nickname

The origin of the nickname Big Ben is the subject of some debate. The nickname was applied first to the Great Bell; it may have been named after Sir Benjamin Hall
Benjamin Hall, 1st Baron Llanover
Benjamin Hall, 1st Baron Llanover PC , known as Sir Benjamin Hall, Bt, between 1838 and 1859, was a British civil engineer and politician.-Political career:...

, who oversaw the installation of the Great Bell, or after boxing's English Heavyweight Champion Benjamin Caunt. Now Big Ben is often used, by extension, to refer to the clock, the tower and the bell collectively, although the nickname is not universally accepted as referring to the clock and tower. Some authors of works about the tower, clock and bell sidestep the issue by using the words Big Ben first in the title, then going on to clarify that the subject of the book is the clock and tower as well as the bell.

Significance in popular culture

The clock has become a symbol of the United Kingdom and London, particularly in the visual media. When a television or film-maker wishes to indicate a generic location in Britain, a popular way to do so is to show an image of the Clock Tower, often with a red double-decker bus
Routemaster
The AEC Routemaster is a model of double-decker bus that was built by Associated Equipment Company in 1954 and produced until 1968. Primarily front-engined, rear open-platform buses, a small number of variants were produced with doors and/or front entrances...

 or black cab in the foreground.
The sound of the clock chiming has also been used this way in audio media, but as the Westminster Quarters are heard from other clocks and other devices, the unique nature of this sound has been considerably diluted.
The Clock Tower is a focus of New Year celebrations in the United Kingdom, with radio and TV stations tuning to its chimes to welcome the start of the year. Similarly, on Remembrance Day
Remembrance Day
Remembrance Day is a memorial day observed in Commonwealth countries since the end of World War I to remember the members of their armed forces who have died in the line of duty. This day, or alternative dates, are also recognized as special days for war remembrances in many non-Commonwealth...

, the chimes of Big Ben are broadcast to mark the 11th hour of the 11th day of the 11th month and the start of two minutes' silence.
ITN's News at Ten opening sequence features an image of the Clock Tower with the sound of Big Ben's chimes punctuating the announcement of the news headlines, and has done so on and off for the last 41 years. The Big Ben chimes (known within ITN as "The Bongs") continue to be used during the headlines and all ITV News
ITV News
ITV News is the branding of news programmes on the British television network ITV. Since 1955, ITV's news bulletins have been produced by Independent Television News . The channel's news coverage has won awards from the Royal Television Society, Emmy Awards and BAFTAs. Between 2004 and 2008, the...

 bulletins use a graphic based on the Westminster clock dial. Big Ben can also be heard striking the hour before some news bulletins on BBC Radio 4
BBC Radio 4
BBC Radio 4 is a British domestic radio station, operated and owned by the BBC, that broadcasts a wide variety of spoken-word programmes, including news, drama, comedy, science and history. It replaced the BBC Home Service in 1967. The station controller is currently Gwyneth Williams, and the...

 (6 pm and midnight, plus 10 pm on Sundays) and the BBC World Service
BBC World Service
The BBC World Service is the world's largest international broadcaster, broadcasting in 27 languages to many parts of the world via analogue and digital shortwave, internet streaming and podcasting, satellite, FM and MW relays...

, a practice that began on 31 December 1923. The sound of the chimes are sent in real time from a microphone permanently installed in the tower and connected by line to Broadcasting House
Broadcasting House
Broadcasting House is the headquarters and registered office of the BBC in Portland Place and Langham Place, London.The building includes the BBC Radio Theatre from where music and speech programmes are recorded in front of a studio audience...

.
Londoners who live an appropriate distance from the Clock Tower and Big Ben can, by means of listening to the chimes both live and on the radio or television, hear the bell strike thirteen times on New Year's Eve. This is possible due to what amounts to an offset between live and electronically transmitted chimes since the speed of sound
Speed of sound
The speed of sound is the distance travelled during a unit of time by a sound wave propagating through an elastic medium. In dry air at , the speed of sound is . This is , or about one kilometer in three seconds or approximately one mile in five seconds....

 is a lot slower than the speed of radio waves. Guests are invited to count the chimes aloud as the radio is gradually turned down.

The Clock Tower has appeared in many films, most notably in the 1978 version of The Thirty Nine Steps, in which the hero Richard Hannay
Richard Hannay
Major-General Sir Richard Hannay, KCB, OBE, DSO, Legion of Honour, is a fictional secret agent created by Scottish novelist John Buchan. In his autobiography, Memory Hold-the-Door, Buchan suggests that the character is based, in part, on Edmund Ironside, from Edinburgh, a spy during the Second Boer...

 attempted to halt the clock's progress (to prevent a linked bomb detonating) by hanging from the minute hand of its western dial. In the fourth James Bond
James Bond
James Bond, code name 007, is a fictional character created in 1953 by writer Ian Fleming, who featured him in twelve novels and two short story collections. There have been a six other authors who wrote authorised Bond novels or novelizations after Fleming's death in 1964: Kingsley Amis,...

 film Thunderball
Thunderball (film)
Thunderball is the fourth spy film in the James Bond series starring Sean Connery as the fictional MI6 agent James Bond. It is an adaptation of the novel of the same name by Ian Fleming, which in turn was based on an original screenplay by Jack Whittingham...

a mistaken extra strike of Big Ben on the hour is designated by criminal organisation SPECTRE
SPECTRE
SPECTRE is a fictional global terrorist organisation featured in the James Bond novels by Ian Fleming, the films based on those novels, and James Bond video games...

 to be the signal that the British Government has acceded to its nuclear extortion demands. The gag phrase "Big Ben! Parliament!" is repeated for comic effect by Chevy Chase
Chevy Chase
Cornelius Crane "Chevy" Chase is an American comedian, writer, and television and film actor, born into a prominent entertainment industry family. Chase worked a plethora of odd jobs before moving into comedy acting with National Lampoon...

 in National Lampoon's European Vacation
National Lampoon's European Vacation
European Vacation is a 1985 comedy film. The second film in National Lampoon's Vacation film series, it was directed by Amy Heckerling and stars Chevy Chase and Beverly D'Angelo. Dana Hill and Jason Lively replace Dana Barron and Anthony Michael Hall as Griswold children Audrey and Rusty...

as the depicted family remains stuck on the Lambeth Bridge Roundabout
Lambeth Bridge
Lambeth Bridge is a road traffic and footbridge crossing the River Thames in an east-west direction in central London, England; the river flows north at the crossing point...

. It was also used in the filming of Shanghai Knights
Shanghai Knights
Shanghai Knights is a 2003 action-comedy film. It is the sequel to Shanghai Noon. It was directed by David Dobkin and written by Alfred Gough and Miles Millar.-Plot:...

starring Jackie Chan
Jackie Chan
Jackie Chan, SBS, MBE is a Hong Kong actor, action choreographer, comedian, director, producer, martial artist, screenwriter, entrepreneur, singer and stunt performer. In his movies, he is known for his acrobatic fighting style, comic timing, use of improvised weapons, and innovative stunts...

 and Owen Wilson
Owen Wilson
Owen Cunningham Wilson is an American actor and writer, known for his roles in the films The Haunting, The Royal Tenenbaums, Zoolander, Meet the Parents, Wedding Crashers, You, Me and Dupree, Bottle Rocket, the Cars series, The Darjeeling Limited, Marley & Me, Midnight in Paris, Shanghai Noon,...

, and was depicted as being partially destroyed in the Doctor Who
Doctor Who
Doctor Who is a British science fiction television programme produced by the BBC. The programme depicts the adventures of a time-travelling humanoid alien known as the Doctor who explores the universe in a sentient time machine called the TARDIS that flies through time and space, whose exterior...

episode "Aliens of London
Aliens of London
"Aliens of London" is the fourth episode of the first series of the British science fiction television show Doctor Who that was first broadcast on 16 April 2005. The Doctor takes Rose back to 21st century London, just in time to witness a spaceship crashing into the River Thames, triggering a...

". An animated version of the clock and its inner workings were also used as the setting for the climactic final battle between Basil of Baker Street
Basil of Baker Street
Basil of Baker Street is a children's book series created by Eve Titus and illustrated by Paul Galdone. The stories focus on Basil of Baker Street and his personal biographer Doctor David Q. Dawson. Together they solve the many crimes and cases of the mouse world...

 and his nemesis Ratigan in the Walt Disney
Walt Disney
Walter Elias "Walt" Disney was an American film producer, director, screenwriter, voice actor, animator, entrepreneur, entertainer, international icon, and philanthropist, well-known for his influence in the field of entertainment during the 20th century. Along with his brother Roy O...

 animated film The Great Mouse Detective
The Great Mouse Detective
The Great Mouse Detective is a 1986 animated feature produced by Walt Disney Feature Animation, originally released to movie theaters on July 2, 1986 by Walt Disney Pictures...

as well as Peter Pan
Peter Pan
Peter Pan is a character created by Scottish novelist and playwright J. M. Barrie . A mischievous boy who can fly and magically refuses to grow up, Peter Pan spends his never-ending childhood adventuring on the small island of Neverland as the leader of his gang the Lost Boys, interacting with...

where Peter lands on the clock before they head to Neverland. It is shown being destroyed by a UFO in the film Mars Attacks!
Mars Attacks!
Mars Attacks! is a 1996 American science fiction film directed by Tim Burton and based on the cult trading card series of the same name. The film uses elements of black comedy, surreal humour, and political satire, and claims to be also a parody of multiple science fiction B movies...

, by a prehistoric creature in Gorgo, and by a lightning bolt in the film The Avengers. It is destroyed on purpose and quite graphically in the movie V for Vendetta
V for Vendetta (film)
V for Vendetta is a 2005 dystopian thriller film directed by James McTeigue and produced by Joel Silver and the Wachowski brothers, who also wrote the screenplay. It is an adaptation of the V for Vendetta comic book by Alan Moore and David Lloyd...

and is flooded in the film Flood
Flood (film)
Flood is a British disaster film from 2007, directed by Tony Mitchell It features Robert Carlyle, Jessalyn Gilsig, David Suchet and Tom Courtenay, and is based on the 2002 novel of the same name by Richard Doyle.-Synopsis:...

. In Reign of Fire, it is destroyed by dragons. The apparent "thirteen chimes" detailed above was also a major plot device in the Captain Scarlet and the Mysterons
Captain Scarlet and the Mysterons
Captain Scarlet and the Mysterons, often referred to as Captain Scarlet, is a 1960s British science-fiction television series produced by the Century 21 Productions company of Gerry and Sylvia Anderson, John Read and Reg Hill...

episode, "Big Ben Strikes Again
Big Ben Strikes Again
"Big Ben Strikes Again" is the third episode of the Supermarionation television series Captain Scarlet and the Mysterons. It was first broadcast in the UK on on ATV Midlands, written by Tony Barwick and directed by Brian Burgess...

".

During the 2010 General Election the results of the national exit poll were projected onto the face of Big Ben.

Accolades

A survey of 2,000 people found that the tower was the most popular landmark in the United Kingdom.

Big Ben was polled as the Most Iconic London Film
London in film
London has been used frequently both as a filming location and as a film setting. These have ranged from historical recreations of the Victorian London of Charles Dickens and Sherlock Holmes, to the romantic comedies of Bridget Jones's Diary and Notting Hill, by way of crime films, spy thrillers,...

Location
.

External links

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