Sunlight? You have a clock driven heliostat generate a fixed beam of light. Sure, your sync mechanism only works half the day (half the "clear" days)...
There's a whole literature on regulating light intensity of flames, dating back to Faraday, if not earlier. On 1/9/10 6:13 PM, "Bob Camp" <[email protected]> wrote: > Hi > > It's probably independent of the light as long as you have a linear spring. My > concern is that you likely do not have a completely linear spring. > > Since by definition you can't use an electric light, some kind of gas light > would be an option. I suspect that if you regulate pressure you could keep the > light pretty constant. Dry gas for both the fuel and oxidizer would take out > the humidity issue. > > Bob > > > On Jan 9, 2010, at 8:39 PM, J. Forster wrote: > >> No, I don't think so. >> >> The period of a pendulum is independent of the amplitude of the swing to >> first order, at least. I think the same applies to a torsional pendulum. >> Maybe moreso if the fiber is a linear torsional spring. >> >> -John >> >> ================= >> >>> Hi >>> >>> All you would still need is a way to regulate the light intensity. >>> >>> Bob >>> >>> >>> On Jan 9, 2010, at 7:58 PM, J. Forster wrote: >>> >>>> Consider this: >>>> >>>> A torsion pendulum with blackened vanes on the perimeter suspended from >>>> a >>>> fiber. Part way up the fiber is an optical shutter and a small fixed >>>> magnet so the shutter is stable in two positions with some hysteresis. >>>> One >>>> position lets light fall on the vanes, one does not. >>>> >>>> This would make an optically pumped pendulum w/ no electronics. >>>> >>>> -John >>>> >>>> ============== >>>> >>>> >>>> >>>> >>>>> Hi >>>>> >>>>> If you abandoned the non-elecronic side of the requirement, you could >>>>> hit >>>>> it with a pulsed LED and probably get phase data off of a couple of >>>>> photo >>>>> detectors. >>>>> >>>>> Crazy stuff ... >>>>> >>>>> Bob >>>>> >>>>> >>>>> On Jan 9, 2010, at 6:21 PM, 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 >>>>>> >>>>>> ============= >>>>>> >>>>>> >>>>>> >>>>>>> Like a magnetically coupled escapement >>>>>>> Sent via BlackBerry by AT&T >>>>>>> >>>>>>> -----Original Message----- >>>>>>> From: Bob Camp <[email protected]> >>>>>>> Date: Sat, 9 Jan 2010 12:36:11 >>>>>>> To: Discussion of precise time and frequency >>>>>>> measurement<[email protected]> >>>>>>> Subject: Re: [time-nuts] Non electrical time-nuttery >>>>>>> >>>>>>> Hi >>>>>>> >>>>>>> How about a rotary pendulum on a quartz fiber spring with some kind >>>>>>> of >>>>>>> trick magnets to drive it / read it out? Put the pendulum and spring >>>>>>> inside an evacuated glass envelope to get around the vacuum pump >>>>>>> issue. >>>>>>> The enclosure could be pretty small. >>>>>>> >>>>>>> Drive the magnets with a second external clock, and feedback >>>>>>> compensate >>>>>>> it. Let the external clock do all the readout via a very normal gear >>>>>>> and >>>>>>> pointers system. The trick would be getting the feedback loop to work >>>>>>> purely mechanically with enough gain to "unload" the master pendulum. >>>>>>> >>>>>>> Bob >>>>>>> >>>>>>> >>>>>>> On Jan 9, 2010, at 2:07 PM, Lux, Jim (337C) wrote: >>>>>>> >>>>>>>> OK.. So we're moving back in electrical technology.... >>>>>>>> But what about mechanical? Could modern technology get a >>>>>>>> substantial >>>>>>>> (>order of magnitude) improvement over 19th century chronometers >>>>>>>> (either >>>>>>>> pendulum or balance wheel or whatever). I know there's some really >>>>>>>> good >>>>>>>> quartz fiber torsional spring schemes, but I think they still need >>>>>>>> electrical means to keep them moving and to read it out. >>>>>>>> >>>>>>>> So how good can one do with a mechanical, hydraulic, (or chemical, I >>>>>>>> suppose) system? Let's assume it has to have a "direct" readout >>>>>>>> that >>>>>>>> is >>>>>>>> human readable by a causal bystander. (this starts to sound like >>>>>>>> the >>>>>>>> 10,000 year clock or whatever it is..) >>>>>>>> _______________________________________________ >>>>>>>> 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. >>>>> >>>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> 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.
