The 13-tonne Big Ben bell was largely silenced for five years while a major restoration of the Elizabeth Tower took place, with the “bongs” finally resuming regular service in November 2022.
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Although the clock will only be out of action for two years, the bells have to be silenced for the entire renovation period to protect the workers' hearing. The Big Ben bell weighs 13.76 tonnes and chimes at 118 decibels. At that volume, people would suffer hearing damage after just 14 seconds of exposure.
Visitors will be able to book a maximum of eight tickets per person, depending on availability. The Big Ben tour is not suitable for everyone. Visitors must be aged 11 and over and be comfortable climbing 334 steps and experiencing high noise levels from the clock mechanism and bells - earplugs will be provided.
Maintenance work was performed on the clock in 2007. On August 21, 2017, Big Ben stopped chiming, as the tower was undergoing a four-year restoration project during which the bell was scheduled to ring only for special events, notably New Year's Eve and Remembrance Sunday.
Prime Minister David Cameron welcomed the name change. “The renaming of the Clock Tower to the Elizabeth Tower is a fitting recognition of the Queen's 60 years of service. This is an exceptional tribute to an exceptional monarch,” he said. Reactions among the public were mixed, however.
At close proximity, the sound of Big Ben measures 118 decibels, which is loud enough to cause physical pain. To make the bell chime, the copper and tin bell is struck by a hammer weighing 200kg. The bell, weighing 13.7 tonnes itself, makes the musical note “E” when struck.
However, it is one of the most unusual aspects of the Elizabeth Tower. 114 steps up inside the tower is the Prison Room, but you don't need to worry about being locked up there yourself. The prison room was used for MPs who breached codes of conduct, but it hasn't been used since 1880.
The clock tower, which is also known as the Elizabeth Tower, is 315 feet (96 meters) tall and has 393 steps. The clock mechanism weighs five tons. Its pendulum is 12.8 feet (3.9 meters) long. The Great Bell weighs 13.5 tons.
One of the most visible changes to the tower has been the restoration of the clock-face framework to its original colour of Prussian blue, used when the tower was first built in 1859, with the black paint that was used to cover up the soot-stained dial frames now having been stripped away.