Big Ben: 10 fast facts about the Great Clock
Everything you need to know about the British Parliament's famous clock and the plans to silence its bongs
Big Ben is to be silenced for four years today following its twelfth bong at midday in order for renovation work to be carried out on the Great Clock and the Elizabeth Tower.
The Lords and Commons Commissions ordered a halt to the ringing to protect the hearing of construction workers after the £29m refurbishment began, but the Prime Minister has asked for an "urgent" inquiry to see if the bell can chime more often.
With the exception of special occasions such as New Year's Eve, Big Ben will not mark the hour again until 2021.
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Here are 10 fast facts about Big Ben:
What is the Elizabeth Tower and why is its bell called Big Ben?
The Elizabeth Tower is the parliamentary tower holding the Great Bell nicknamed Big Ben. The bell's name is likely to have come from Sir Benjamin Hall, first commissioner for works, whose name is inscribed on it, according to the UK parliamentary website. Another theory is that it was named after Ben Caunt, a champion heavyweight boxer.
When was it made?
In the mid 19th-century. The first bell was cast at Warners of Norton near Stockton-on-Tees. In 1857, the bell developed a four-inch crack during testing. The manufacturer and designer clashed over who was to blame. In 1858, the second bell was cast by the Whitechapel Bell Foundry in east London. A carriage, drawn by 16 white horses, transported the bell to New Palace Yard where it was raised to the belfry.
Who designed Big Ben?
Architect Charles Barry, who won the commission for rebuilding the Houses of Parliament after the 1834 fire and whose designs included a clock tower. A dispute broke out with many clockmakers wanting to be involved, so a competition was held. The respected clockmaker Edward John Dent was appointed in 1852 to build the clock to the designs of Edmund Beckett Denison, a barrister and gifted amateur clockmaker.
When did it last fall silent?
The bell last fell silent when maintenance took place in 2007 and prior to that between 1983-5 as part of a large refurbishment programme. Big Ben has marked the hour with almost unbroken service for the past 157 years.
What note does it hit?
Big Ben strikes every hour to the note of 'E' and weighs 13.7 tonnes. It's accompanied by four quarter bells that chime every 15 minutes (these will also be silenced until 2021).
How does it work?
The Great Clock is operated by a custom-built Victorian mechanism that relies on gravity to trigger the bongs. In order to stop the bells, the striking hammers will be locked and the bell disconnected from the clock mechanism. This allows Big Ben to tell the time silently. The Great Clock first started keeping time in May 1859 and in July 1859 Big Ben first struck time. BBC Radio first broadcast Big Ben's chimes to the UK on New Year's Eve 1923.
Who changes the time?
The Palace of Westminster clockmakers who are responsible for changing the time when British Summer Time finishes and Greenwich Mean Time begins – they do the same each spring. Clockmakers also care for 2,000 other clocks throughout the Palace of Westminster and the parliamentary buildings.
How is it being fixed?
The refurbishment involves dismantling the clock piece-by-piece with each cog examined and restored. The clock dials are framed in cast iron and glazed with 312 separate pieces of opal glass. Four dials will be cleaned, the hands will be refurbished, the glass will be repaired and the cast iron framework will be renewed. While the clock mechanism is out of action, a modern electric motor will drive the clock hands. Big Ben's face will be covered but to ensure the public can set their watches during the refurbishment, one working clock face will always remain visible.
Will public tours be possible?
No. Big Ben is normally open for tours three times a day, but because of the refurbishment, tours temporarily stopped last December. They will not restart until 2021 at the earliest.
How many steps are in the tower?
There are 334 steps to the belfry and another 59 to the lantern (the Ayrton Light).
MPs to bow heads for 'final bongs'
21 August
At midday today, MPs from all parties are expected to attend a solemn gathering, their heads bowed, to hear the last from one of the biggest noises at parliament: Big Ben.
The bell – and the clock that triggers it – are to be stopped while renovations are carried out on the 147-year-old building. The length of the outage has caused dismay among some MPs, as has the reason for the hiatus: health and safety concerns about the hearing of builders.
Theresa May said last week that it "can't be right" for the bell to be silenced until 2021, when the repairs are finished – although it will be rung on special occasions such as New Year and Remembrance Sunday.
Late this morning, members will gather outside the Palace of Westminster in anticipation of the last bongs. Labour's Stephen Pound MP said he would be there with at least 20 "like-minded traditionalists … with our heads bowed but hope in our hearts".
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