Quote:
Originally Posted by Easy E
I see this, but with your higher spd rate your amplitude(s) are also higher = at least relative to most of mine. Is there an example of spd + with too low amplitude?
Also, from one of the articles you sent:
"It’s inversely proportional to the amplitude. That means that a decline in amplitude will cause the rate to increase."
I think this makes sense to me. Yet, in each of my cases so far I see exactly the opposite. Amplitude drops and spd drops accordingly. This is also what I have been able to gather from this thread. Low = low.
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From the article:
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"What exactly is the rate of a watch? It’s how fast or slow a watch runs in seconds per day.
It’s inversely proportional to the amplitude. That means that a decline in amplitude will cause the rate to increase. If the amplitude is low, a balance wheel doesn’t have to “travel” that far so it takes less time to complete a beat."
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This statement, in its generalizing form, is wrong. It contradicts one basic aspect in horology, which is called
isochronism.
Isochronism is the property of an oscillator, such as a simple pendulum or the balance wheel of a mechanical watch, of having a period that is independent of the oscillator amplitude.
In other words, a watch balance wheel that needs the same time to complete a swing (back and forth) no matter how large the swing amplitude is, has the property of isochronism.
Below a nice illustration for isochronism.
We see 5 differently colored pendulums that swing with different amplitudes within the same period. They swing isochronously.
Source:
http://www.snglrtywatch.com/all/how-...atch-movement/
It is difficult (or even impossible) to build a perfectly isochronous mechanical watch movement, but one can come close to isochronism.
Of course, when caliber amplitudes drop below a certain value then the rates start to become strongly negative, which is normal for all mechanical movements because there is not enough remaining power reserve.