“The clock was installed in the Clock Tower in April 1859”

Big Ben2009 marks the 150th anniversary of the completion of the current UK parliamentary clock tower, the installation of the clock, and the first chiming of the bell, Big Ben. The UK’s parliamentary website is hosting a mini-site on the anniversary detailing the history of earlier towers, and a sundial, as well as the delays in building the current one. There are also some images from the Parliamentary Works of Art collection. Adds In the comments zone Rory reminded me that a leap second was added to the end of last year, and this BBC report on that extra second includes a fascinating look at the clock mechanism designed by Edmund Beckett Denison.