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F.P. Journe

Thank you very much! - Makes much more sense now...

 

still a bit confused as to why on the website it says the flying second hand moves in 1/16 sec increments, and don't if i am honest understand completely how the hand is slowed down by 1/60 sec but I am no watchmaker.

Essenatilly what is now clear to me is that the hand does 1 revolution / sec, which is well within the "spec" of the movement, and Mr Journe has developed three innovative things:

It has a separate power source so does not impact the amplitude of the watch when the chrono is activated and stopped.

The motion of the flying second hand has been smoothed from 6 jumps in one revolution to 60 (basically continuous motion based on the film analogy)

The ability to freeze the hand at any point.

 

Thus IMO I can sort of see that if you have a hand that does exactly one rotation / sec as smoothly as possible (2.5 times smoother than a movie clip) and it can be stopped at any point - increments down to 1/100th sec can be measured and the frequency is largely irrelevant.

Thank you Mr Journe

 

Mark

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16 Comments view entire thread 

Are we going to get some info from FP Journe on the Centigraph at some point?

 
By: markkeenan : December 16th, 2008-03:20
I completely understand that he has been very busy with the Paris Boutique, but there are a lot of unanswered questions on the exact workings of the Centigraph, and judging from the amount of posts, significant interest in these answers. Journe has positi... 

From FPJ

 
By: bs22fly : December 16th, 2008-14:29
Dear Brad, The escapement of the Centigraphe beats at 21600 and counts 6 stops per second. If there was nothing else to regulate the speed of the hand, it would look like the movement of a "foudroyante". Thus, on the axis of the hand there is a 30 teeth w... 

So the smallest unit of discrimination is 1/60th of a second...

 
By: LarryFRCGP : December 16th, 2008-19:19
not 1/100th of a second. Why should it be called Centigraphe????? And this answer does not confirm or disprove the Centigraphe's ability to be stopped at a particular 1/60th of a second, i.e., if one has a quick enough hand to start-stop the flying hand, ... 

Brilliant....

 
By: Quarks : December 17th, 2008-09:21
Brilliant explanation. Thanks to Mark for his relentless pursue for an answer which in turns helped us better understand how the centigraphe works, and to Brad for providing us the information from the man himself. On a side note, there is an interested i... 

Ohh sounds interesting Aaron

 
By: BluNotte : December 17th, 2008-19:03
I'v didnt seem to catch brad's post about the 2nd iteration of the Vagabondage, care to show me the lead? Also, what's this about a Chronometre Optimum, sounds like my kinda stuff! I'm not in Singapore now, so can't get the magazine it might be in, so car... 

Chronometre Optimum....

 
By: Quarks : December 18th, 2008-05:20
Stephen, In the interview, he simply mentioned Chronometre Optimum as one of the upcoming projects in the future. Nothing more I'm afraid. I have came across 'Chronometre Optimum' in a previous interview. I am in the midst of browsing through my stack of ... 

An interesting article on Centrigraphe....

 
By: Quarks : December 18th, 2008-05:41
An interesting article on Centrigraphe which I have just found.... Here are some of the excerpts (taken from Revolution Issue 11, by Ian Skellern) Power for the chronograph function- "Journe has used a similiar mainspring configuration to the one he inven... 

Unfortunately none of these posts really answers the question...

 
By: albcwc : January 4th, 2009-12:13
This last one seems to suggest that, while the hand is running, it moves once every 1/16th of a second, but that when the user "stops" the hand, it can measure time in increments between two adjacent 1/16ths of a second. Of course, it cannot literally be ...