Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and is often extended to refer to the clock or the clock tower as well Big Ben is the largest four-faced chiming clock and the third-tallest free-standing clock tower in the world It celebrated its 150th anniversary in May 2009 (the clock itself first ticking on 31 May 1859during which celebratory events took place.The clock is famous for its reliability. The designers were the lawyer and amateur horologist Edmund Beckett Denison, and George Airy, the Astronomer Royal. Construction was entrusted to clockmaker Edward John Dent, who 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 as originally designed, Denison invented the double three-legged gravity escapement. This escapement provides the best separation between pendulum 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; 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, reducing the effective length of the pendulum rod and hence the rate at which the pendulum swings. Adding or removing a penny will change the clock's speed by 0.4 second per day.

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BBC London (launched as BBC LDN) is the BBC English Region producing local radio, television, teletext and online services in London and parts of the surrounding area. Its output includes the daily BBC London News and the weekly Politics Show on television, the BBC London 94.9 radio station and local coverage of the London area on BBC Online and Ceefax. The region's headquarters are situated in the new Egton Wing complex of Broadcasting House.

Trafalgar Square is a square in central London, England. With its position in the heart of London, it is a tourist attraction; and one of the most famous squares in the United Kingdom and the world. At its centre is Nelson's Column, which is guarded by four lion statues at its base. Statues and sculptures are on display in the square, including a fourth plinth displaying changing pieces of contemporary art, and it is a site of political demonstrations.

The name commemorates the Battle of Trafalgar (1805), a British naval victory of the Napoleonic Wars. The original name was to have been "King William the Fourth's Square", but George Ledwell Taylor suggested the name "Trafalgar Square".

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