Also, according to some info I read on pendulum clocks, vacuum does not work because some viscous drag is needed to damp the free pendulum; reduced pressure is good, vacuum bad... (dampening, btw, is for laundry) Don L
Neville Michie > The clock is not actually driven by light, which has a very small > momentum, > but by molecular kinetic energy. The mica sheets are heated on one > side by radiant energy > while their other side stays cool. The thin air in the vessel has a > larger than normal > molecular mean free path length. All molecules are vibrating with > Brownian motion, > when an air molecule impinges on a hot side of the mica > it picks up some kinetic energy, more than if it hit the cool side. > This is enough to give a small thrust. > If you pump the tube down to a hard vacuum then the effect stops. > It still is an interesting clock, but a magnetic field or an > electrostatic field could also > be used to maintain the pendulum. > > cheers, Neville Michie > > > On 12/01/2010, at 8:36 AM, Bill S wrote: > >> There is actually an "optically pumped" pendulum clock that was >> designed by Betrisy called the Chronolith. Conceptually really >> interesting. You can see it on his website: http://www.betrisey.ch/ >> echronolit.htm >> >> Bill S >> >> >> J. Forster wrote: >>> Maybe you could "pump" the pendulum optically, using a beam of >>> light, like >>> those glass bulb "radiometers" they sell that spin on a sunny window >>> ledge. >>> >>> -John >>> >>> ============= >>> >>> >>> >>> >> >> >> _______________________________________________ >> 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. > -- Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com _______________________________________________ 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.
