[time-nuts] A different timenuts interest
Bob Camp
lists at rtty.us
Thu Jul 22 16:52:58 UTC 2010
Hi
At > $30K certainly not cheap. My guess is that the building modifications
and permits will set you back a pretty significant chunk of money as well.
The issue of troubleshooting a 6 story high machine in a public space (plus
insurance issues) likely makes the "proven design" a much better decision
than a one off.
Bob
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Brooke Clarke
Sent: Thursday, July 22, 2010 10:38 AM
To: Discussion of precise time and frequency measurement
Cc: Morris Odell
Subject: Re: [time-nuts] A different timenuts interest
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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