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Horological Meandering

Chronometer Certificates only assure consistency

 

Hi

Just thought I will share with you some remarks on accuracy and consistency of watch performance ( I came across this in FPJourne catalog on the subjet of chronometry).

Typically a chronometer certification certifies the deviation of the watch in various positions and temperature changes. Once it leaves say Geneva ( as typical swiss... watches ), the watch would be subject to a different gravitational pull by virtue of its new location ( say in Singapore versus Geneva) and this affects the timing. The next will be the temperature which has a significant bearing on the deviation.

Thus if a  watch gains 5 seconds per day in Singapore compared to  being 1 second slow in Geneva ( when it left after chronometer certification), all it needs to exhibit as a behaviour is to gain the same 5 seconds each day without erratic deviations. The watch can be certified as Accurate.

Thus it is not the deviation but the consistency of the rate of change or deviation that determines if a watch can be termed to be running accurately.

 

Regards

 

narsi

 

 

 

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11 Comments view entire thread 

What is a chronometer certificate worth?

 
By: pisoi : February 18th, 2008-07:00
Hello to all PuristS, I have been reading this site for at least two years without registering. This is my first post because I really need your opinion on something I find rather strange. So, here it goes: I have a small collection of watches and that I ... 

First....pisoi....

 
By: MTF : February 18th, 2008-10:42
Welcome to the world of a poster rather than a lurker ! That wasn't so painful was it? Next, a slap on the wrist for taking 2 years to lose your posting virginity - is that a PuristS' record? That is why the more stringent tests at 'Qualite Fleurier' and ... 

A slap on the wrist? Well, maybe I deserve one...

 
By: pisoi : February 19th, 2008-02:45
...but you'll have to wait until I take off the mega-complicated extremely limited edition five-year waiting list watch that I'm just wearing (brand and model witheld for personal security reasons). You know those flying tourbillons are not as shock-proof... 

It's very valuable: it gives you a license to complain to the manufacturer.

 
By: mkvc : February 18th, 2008-11:11
In my experience, if you don't like the way your watch keeps time and complain to the manufacturer, you stand an excellent chance of being told that the watch is "within specification" and the manufacturer will not correct it. If your watch has a chronome... 

Chronometer Certificates only assure consistency

 
By: chintu : February 19th, 2008-04:00
Hi Just thought I will share with you some remarks on accuracy and consistency of watch performance ( I came across this in FPJourne catalog on the subjet of chronometry). Typically a chronometer certification certifies the deviation of the watch in vario... 

Looks like good news.

 
By: pisoi : February 19th, 2008-05:09
Since it means these watches are certified as being accurate and therefore can be set to run properly (within limits) using the rate regulation mechanisms found in all of them. Thanks

Thoughts

 
By: nickd : February 19th, 2008-10:03
Hi Narsi, I'm a bit confused about some of the points in the info you quote. For example, I'm not at all sure that variations in gravity are a major, or even a minor, concern for wristwatches. Given that movements like the Lemania 5100 are known to be abl...