[time-nuts] NPR story on coupled pendulums

[Eric Garner]

Is there any stability benefit to having a bunch of "coupled" pendulum
clocks?

On Wed, Jul 29, 2015 at 4:22 PM, Bill Beam <wbeam at 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-bounces at febo.com] On Behalf Of Hal
> >Murray
> >Sent: Tuesday, July 28, 2015 10:55 PM
> >To: time-nuts at 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.
>
>
>
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>
> Bill Beam
> NL7F
>
>
>
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-- 
--Eric
_________________________________________
Eric Garner