Who Needs Constant Force?
An Insider's Look at F.P. Journe: Part 2
by Pierre Halimi
This article: Who Needs Constant Force? An Insider’s Look at F.P. Journe (Part 2) was originally posted on WatchTime.com. WatchNews.nawcc.org was given permission to publish this article by the author (Pierre Halimi) and Joe Thompson (Editor-in-Chief of WatchTime). To visit the orginal link you may find the link at the bottom of this article.
1977. Paris. A young watchmaker of 20 embarks on an odd quest—to make his own tourbillon. Not to sell, not to show, but simply to prove that he can do it. Passionate and determined, equipped only with George Daniels' book The Art of Breguet, Francois-Paul Journe sets to work.
1983. Paris. Francois-Paul Journe completes his first watch.
It took more than five years to conceive and create a pocket watch that was never meant to be sold—and not just a simple watch, but a tourbillon. In the '70s and '80s tourbillons were not the craze they are now. Only George Daniels (and then Journe) created a new, modern tourbillon.
Forward to 1984. Still trying to master the tourbillon (and especially the pernicious effects it has on accuracy), François-Paul makes his first Remontoir d'Egalité in his second and fourth (pocket) watch. It caught the attention of a major collector, Eugen Gschwind (Google the name or visit his collection at the Historiches Museum Basel).
Francois Paul Journe 4th watch (1984)
Francois Paul Journe 4th watch (1984)
Fast-forward now to 1991. Francois-Paul Journe creates his first wristwatch—a tourbillon, of course, but also fitted with a remontoir d'égalité, or constant force. This sort of device became popular a few years ago (thanks in part to great articles such as Alan Downing's, followed by David Chokron's in-depth writings in Watch Around, No.15 [Spring-Summer 2013]: 44-53). As one may recall in "Power or Precision? An Insider's Look at F.P. Journe: Part 1," because of the nature of the spring, any mechanical object will have more power when the spring is fully loaded and inversely less as it unwinds. A constant force system is "simply" a system that allows regulating the delivery of energy to the balance wheel. It is not a new issue. Watch masters, such as Breguet, Lepine, and Berthoud, already had that issue in mind. But in 1991 very few people understood it or cared.
What makes F.P. Journe's patented device superior to its new competitors' is the simplicity and the lightness of his device. The heavier the device, the more power needed to move it and the more friction it creates (like a "fusée à chaine," which was a good idea in the eighteenth century but too heavy to be efficient today). The solution becomes counterproductive to the outcome.
Because the remontoir d'égalité delivers the same packet of energy to each and every second, the seconds hand actually moves and dies every second. Thus it is called a dead second. Like a quartz movement, the second hand does not sweep. Note (and this is important to Mr. Journe) that it is a natural dead second, meaning that unlike some of his competitors, his goal is not to make a dead second mechanism (what would be the point?). It is simply a natural by-product of the remontoir.
Francois Paul Journe's first ever wristwatch (1991).
Now part of the F.P. Journe museum collection.
Tourbillon Souverain with Remontoir D'Egalité avec Seconde Morte (Dead Second).
Read also our previous insider's look:
To view the movement: http://www.fpjourne.com/eu/collections-en-sv-csouv-1.html?v=modele
For more information, www.fpjourne.com
Or visit or contact one of our F.P. Journe Boutiques:
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