[LEAPSECS] Adjusting Big Ben video (was Re: Of stepping motors and leap seconds)

Peter Vince petervince1952 at gmail.com
Sat Feb 9 17:50:21 EST 2019

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


An eight-minute video extracted from the Discovery channel's "Blowing Up
History" series, entitled:  The Mechanical Genius of Big Ben



On Fri, 8 Feb 2019 at 13:29, Tom Van Baak <tvb at leapsecond.com> 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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