Sorry Tom, that BBC news item is ten years old, and it looks like the video has been removed. There are a number of videos on Youtube which talk about adding or removing old pennies from the pendulum to correct it. See, for example:
https://www.youtube.com/watch?v=_Elffjsjbio An eight-minute video extracted from the Discovery channel's "Blowing Up History" series, entitled: The Mechanical Genius of Big Ben Regards, Peter On Fri, 8 Feb 2019 at 13:29, Tom Van Baak <[email protected]> wrote: > > There's a wonderful BBC video showing how Big Ben is adjusted for leap > seconds: > > "Leap second: Slowing down Big Ben" [1] > http://news.bbc.co.uk/2/hi/science/nature/7792436.stm > > In this case they do not literally move the massive weight up or down, but > instead, by adding tiny weights (usually penny coins) they change the > effective center of gravity of the bob, which is all that matters. This is > an unexpected application of the saying that "time is money". > > /tvb > > [1] If someone (UK only?) can capture this short video as mp4 I'd > appreciate it. > >
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