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