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

Tony Finch dot at dotat.at
Mon Feb 11 10:44:42 EST 2019

Warner Losh <imp at bsdimp.com> wrote:

> How do they keep big Ben in sync these days? Eg, who decides it is running
> fast or slow?

I don't know about how they do it, but Frank King has written about how he
keeps the University clock in Cambridge reasonably in sync:


The Big Ben chimes were copied from Cambridge. There's another clock in
Trinity College which has a similar mechanism to the Big Ben clock, and a
much more sophisticated monitoring system than the University clock -


The second page of this has pictures of the ajustment weights and how they
are placed on the pendulum.


The setups for adding coins to the pendulums of Big Ben and the University
clock are not quite as beautifully engineered as this!

f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
Fair Isle: Northwest 4 or 5 becoming variable 3, then south or southwest 6 to
gale 8. Moderate or rough, becoming very rough later in west. Wintry showers
then rain. Good, occasionally poor.

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