[time-nuts] A different timenuts interest

Bill Hawkins bill at iaxs.net
Thu Jul 22 13:26:44 EDT 2010


Well, I thought it was interesting that a barrier was needed at least
3 feet away from the swing so that people would not grab the cable. 

Can you imagine the effect of grabbing the cable with a 250 pound bob
attached?

I'd build one called "Evolution in Action." Put a Poe-like blade on
the bottom of the ball and omit the railing. That is, if I had the
money, ah, and the building. And my own country, where allowing idiots
to breed was illegal.

Bill Hawkins

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bob Camp
Sent: Thursday, July 22, 2010 11:53 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] A different timenuts interest

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
>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>
>    


_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.




_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.





More information about the time-nuts mailing list