Yes. The Q is increased. And for a pair operating out of phase (the desired mode), external common mode disturbances are mitigated.
On Thu, 30 Jul 2015 10:14:45 -0700, Eric Garner wrote: >Is there any stability benefit to having a bunch of "coupled" pendulum >clocks? >On Wed, Jul 29, 2015 at 4:22 PM, Bill Beam <wb...@gci.net> wrote: >> These University Of Lisbon "Scientists" have rediscovered a very old wheel. >> >> Old physics: Two coupled nearly identical harmonic oscillators have two >> stable states. >> They will operate with relative phase = zero or 180deg. How they are >> coupled is not >> an issue; they only need to be able to transfer energy one to the other. >> >> Regards >> >> On Wed, 29 Jul 2015 13:44:19 -0500, Bill Hawkins wrote: >> >> >They talk about sound pulses affecting the pendulums. >> >> >Sounds more likely that the mechanical vibration transmitted through the >> >aluminum bar affects the escapements. >> >> >Perhaps the 'tock' side generates the strongest pulse, and the 'tick' >> >side is sensitive enough to be affected by that pulse. >> >> >That would soon have the clocks synchronized out of phase, provided the >> >mounting arrangement did not absorb too much of the pulse energy. >> >> >The situation is similar to synchronizing a TV vertical oscillator >> >(running a bit slow) with the received sync pulse from the broadcast >> >station, no? >> >> >Bill Hawkins >> >> >> >-----Original Message----- >> >From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal >> >Murray >> >Sent: Tuesday, July 28, 2015 10:55 PM >> >To: time-nuts@febo.com >> >Cc: Hal Murray >> >Subject: [time-nuts] NPR story on coupled pendulums >> >> >University Of Lisbon Scientists Solve Pendulum Clock Mystery >> >> >Two professors at the University of Lisbon say they have discovered why >> >the pendulums of clocks set on the same surface will eventually swing >> >together in opposing directions. >> >> >http://www.npr.org/2015/07/28/427178282/university-of-lisbon-scientists- >> >solve- >> >pendulum-clock-mystery >> >> >I thought the NPR story was not very interesting. (But it probably >> >wasn't targeted at time-nuts. :) >> >> >---------- >> >> >Here is the paper: >> > Huygens synchronization of two clocks >> > http://www.nature.com/srep/2015/150723/srep11548/full/srep11548.html >> >> >> >-- >> >These are my opinions. I hate spam. >> >> >> >> >_______________________________________________ >> >time-nuts mailing list -- time-nuts@febo.com >> >To unsubscribe, go to >> >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> >and follow the instructions there. >> >> >_______________________________________________ >> >time-nuts mailing list -- time-nuts@febo.com >> >To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> >and follow the instructions there. >> >> >> >> Bill Beam >> NL7F >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >-- >--Eric >_________________________________________ >Eric Garner >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. Bill Beam NL7F _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.