The Griffith Park exhibit did include a Tesla Coil. Hmmmmm... Don J. Forster > How about putting a high voltage, high frequency on the bob and wire, so > any body part that gets within say 2 feet draws giant arcs? :<)) > > -John > > =============== > > >> 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. >> >> > > > > _______________________________________________ > 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. >
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