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:[email protected]] On Behalf Of Hal >Murray >Sent: Tuesday, July 28, 2015 10:55 PM >To: [email protected] >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 -- [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. Bill Beam NL7F _______________________________________________ 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.
