[time-nuts] A different timenuts interest

Brooke Clarke brooke at pacific.net
Thu Jul 22 14:37:35 UTC 2010


Hi Morris:

See:
http://www.calacademy.org/products/pendulum/pendulum_sales.html
http://www.calacademy.org/products/pendulum/pendspec.pdf
they are not cheap, but a proven design and probably lower in cost than 
making  just one of them.

One of these was working at Foothill College in Los Altos Hills, 
California when I was there.  It was outside in a combined pit and 
tower, but is not longer in use.  It needs to be somewhere inside where 
vandals can not get to it.

Have Fun,

Brooke Clarke
http://www.PRC68.com


Morris Odell wrote:
> Hi all,
>
> I have been asked to help with the construction of a Foucault pendulum. This
> is a long pendulum which oscillates in a slow stately fashion in a fixed
> plane which appears to move as the earth rotates. In reality the surrounding
> environment is really moving relative to the plane of oscillation.
>
> The pendulum requires a sustaining system to compensate for the inevitable
> energy loss with each swing. The system is located in the building and
> therefore rotates relative to the pendulum. It needs to provide an impulse
> which does not affect the plane of oscillation of the pendulum. I was
> thinking of an electromagnet located below the centre of the swing which
> would be pulsed appropriately as the bob passes over it.
>
> Has anyone here had any experience with such a system of have any
> suggestions regarding the sustaining system? This is an interesting and
> challenging project.
>
> Cheers,
>
> Morris
>
>
>
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