On Wed, Jul 21, 2010 at 7:57 PM, J. Forster <j...@quik.com> wrote:
> > I remember one someplace in London too.
>
> Science Museum in South Kensington, I'd expect, but I've not been there
> 20+ years.
>
>
Yes, they have one in one of their open multi-storey stairwells. If I
remember correctly, the energy input is provided by lifting and lowering the
pivot point slightly in sync with the swing, rather than anything done at
the bob end.
Dave
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