I was rather more thinking of the setup that Don was suggesting as not many domestic clocks have a seconds pendulum and it would otherwise take dividing down a referenced oscillator to the correct frequency.
Cheers, Steve On 08/08/2010, Neville Michie <[email protected]> wrote: > Not many clocks are set up with the gear to modulate the rate, > but they are all still sensitive to injection locking. > A tiny rare earth magnet on the pendulum (say 1/2 way down the > pendulum rod) > and a coil fed with a stretched (say 250ms long) PPS or for a seconds > pendulum > PP2S pulse will pull the pendulum into phaselock with a surprisingly > small amount of power. > In fact if you turn off the drive it would keep the pendulum swinging. > Cheers, Neville Michie > > On 08/08/2010, at 6:00 PM, Steve Rooke wrote: > >> This is very interesting and I wonder if the capabilities of this >> system being applied to any clock pendulum. If this sort of control >> any pendulum, then I wonder if it's possible to sync it to some >> standard. >> >> Steve >> >> On 08/08/2010, Don Mimlitch <[email protected]> wrote: >>> Jim Said: >>>> It also has a coil mounted near the pendulum and a fixed magnet >>>> on the >>>> pendulum bar and this coil connects to a box down below with a meter >>>> and a knob. They are labeled in sec/day. The electronics in the box >>>> are not clear (being quite old) but by measuring the current in the >>>> coil it quite simply increases the current one way to slow the clock >>>> and the other way to speed it up. (I'll admit the physics of this >>>> doesn't make sense to me - but it works!) >>> >>> I have a Warren Telechron Master Clock used in Power Stations in >>> the 20's to >>> regulate the 60 Cycle so that household clocks using synchronous >>> motors >>> would be accurate to seconds a day. >>> >>> This clock has a similar permanent magnet at the end of the >>> Pendulum and >>> a battery connected to a potentiometer to adjust the current flow >>> positive >>> or negative in an electro-magnet below the pendulum.. >>> If the bottom of the magnet in the pendulum is "north" and the >>> current in >>> the electromagnet is flowing such that its top face is North, then >>> this will >>> repel the pendulum causing its swing to be wider and contrary to >>> common >>> knowledge the swing of a fixed length pendulum is not constant >>> regardless of >>> the swing. (Huygens discovered this in 1670 an found by forcing >>> the arc of >>> the swing to be cycloid instead of circular he could produce uniform >>> oscillation) Thus if the arc is longer the swing takes more time >>> and the >>> clock runs slower. >>> If the current flows in the opposite direction and the two magnets >>> attract >>> then the arc is shortened and the clock runs faster. Of course my >>> master >>> clock isn't as accurate as a Riefler pendulum clock. Also the >>> magnet in my >>> clock has lost it's magnetism over time and I can't use this >>> regulation. >>> >>> So the goal of your adaptation is to have precision control of the >>> current >>> flow in the positive or negative direction. Others on the list are >>> better >>> then me at describing how you might achieve this. >>> >>> >>> >>> >>> >>> _______________________________________________ >>> 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. >>> >> >> >> -- >> Steve Rooke - ZL3TUV & G8KVD >> The only reason for time is so that everything doesn't happen at once. >> - Einstein >> >> _______________________________________________ >> 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. > -- Steve Rooke - ZL3TUV & G8KVD The only reason for time is so that everything doesn't happen at once. - Einstein _______________________________________________ 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.
