Ogygia
163
Let me try to answer...
what would happen if a Resonance was run in a vacuum?
I think we have to consider how these oscillators damp each other. For Journe's, he use the "rack and pinion" to adjust the angle of the balance bridge. Thus can adjust the distance between 2 balance wheel, and let 2 oscillators damp each other by air fiction. The fine adjustment on angle of bridge is done depends on the air density and the damping effect. So vacuum condition will totally break the damping connection on Journe's! thatz why Journe said the watch should work on sea level...or only work perfect at Journe's factory latitude?? LOL
"rack and pinion" pic post before...
But on the other mechanisms, like the clock on ship. As we consider the ship is floating on water, just like these metronomes sitting on the movable board in the nice video! The damping is working on the oscillation of the system which all these oscillators sitting on. Coupling is done by a transfer on angular momentum. Thus, in these kind of condition air fiction do almost nothing on coupling comparing with angular momentum.
hope this helps
This message has been edited by Ogygia on 2010-05-03 21:21:49
"An odd kind of sympathy"
By: donizetti : May 3rd, 2010-12:00
I have been trying to come to grips with the principle underlying the Resonance. This topic has been discussed before ahci.watchprosite.com but I am not sure there is a conclusion yet. The following is what I have collected from the literature for your co...
Some real food for thought here!
By: Nomer : May 3rd, 2010-15:35
It will probably take a few days to digest and comment more fully, but I wanted to note that in the PurstS discussion you linked there is a further link to a 2002 article on the watch (search for "LINK" in the discussion). That paper notes the behaviour o...
Agnostic
By: AndrewD : May 3rd, 2010-15:53
Very interesting discussion paper, Andreas, Thanks. I don’t have any answers but I do wonder if Mr Journe experimented with different distances between the balance wheels when designing the first Resonance watch. If the synchronisation phenomenon has some...
At 5280 feet (1586 m)...
By: chaser579 : May 3rd, 2010-17:01
"F.P.Journe already point out..that altitude can influence the chronometry of their watches." I wonder if that's true out here in Denver, Colorado at 5280 ft/1586m? That would be interesting to study, besides the inherent 'dryness' of this sem-arid portio...
Let me try to answer...
By: Ogygia : May 3rd, 2010-21:14
what would happen if a Resonance was run in a vacuum? I think we have to consider how these oscillators damp each other. For Journe's, he use the "rack and pinion" to adjust the angle of the balance bridge. Thus can adjust the distance between 2 balance w...
Thanks Ogygia and Terry …
By: AndrewD : May 4th, 2010-15:18
The information is much appreciated. So this confirms that it is air turbulence or, perhaps, friction causing the “resonance” effect. I wonder if at higher air pressures the synchronisation would be greater (even if the accuracy was affected)? What effect...
In my wordings..
By: Ogygia : May 5th, 2010-20:24
I can't agree more on what you said.... IMO, we can focus on the area where 2 balance wheels close to each other. So we only consider up and down motions as it is easier to understand ... If they move up and down exactly in same timing, there is almost no...
air
By: donizetti : May 5th, 2010-03:43
That's very interesting. Did you find it? In principle, I guess vibrations should be transmitted through air and the force would fall off with the distance, so if the balances are really close, which they are, this could be the source of the synchronising...
Perhaps in a vacuum
By: amerix : May 5th, 2010-04:34
the balance wheels would have to be moved closer to each other - perhaps too close to prevent them from touching if subjected to shock. Also Bernoulli's Principle (which enables airplanes to fly) would have no effect in a vacuum, thanks to reduced (here n...
Sympathy for the Resonance
By: amerix : May 5th, 2010-04:12
There is an remarkable series of lectures by Walter H. G. Lewin before a freshman physics class at MIT. I single out Lecture 30: Simple Harmonic Oscillations - Energy Considerations - Torsional Pendulum videolectures(dot)net(slash)mit801f99_lewin_lec30 an...
Great post and thread!
By: schen : May 5th, 2010-07:48
I am never tired of learning the secret behind the Resonance, though never really got it... which just makes the Resonance even more fascinating. BTW, here is another good read that has been posted here before: www.watchprosite.com /
