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THE CHRONOMÈTRE À RÉSONANCE F.P.JOURNE
celebrates its 20 th anniversary
celebrates its 20 th anniversary
The first observations pertaining to the natural resonance phenomenon were made by 17 th century Dutch scientist Christiaan Huygens, fol-lowed by 18 th century horologists Antide Janvier and Abraham-Louis Breguet, who developed timepieces based upon this principle. Since then, François-Paul Journe is the first and only watchmaker to manufacture wristwatches that perform through acoustic resonance.
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Conceived, developed and built to meet the demands of actual wear on the wrist and thereby provide chronometric performance driven to extremes, this watch represents one of the wildest challenges in the field of mechanical watches! Each of the two balances alternately serves as exciter and resonator.
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When the two balances are in movement, they enter into harmony thanks to the resonance phenomenon and begin to beat naturally in opposition. The two balances then support each other, giving more inertia to their movement. This result is possible only if the difference of the frequency from one to the other does not exceed 5 seconds per day cumulated on six positions. Their setting is an nextremely delicate task.
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Whereas an external disturbance affects the running of a traditional mechanical watch, the same disturbance, for the Chronomètre à Résonance, produces an effect that accelerates one of the balances as much as it slows down the other. Little by little, the two balances come back towards each other to find their point of harmony, thus eliminating the disturbance, and beating in perfect synchronization.
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Click, to see the large size. ▶ BIG FOTO
François-Paul Journe has conceived several versions of his wristwatch throughout the last 20 years; the first 20 by Subscription (2000), the first collection series (2001), the Ruthenium series (2001-2002), with movement in 18K rose Gold (2005), the digital 24 hours Résonance (2010), the analogic 24 hours Résonance (2019), and the new Chronomètre à Résonance (2020).
Moving towards more precision, always!
The new Chronomètre à Résonance has only one single barrel spring to provide power for the two movements. A differential placed on the first wheel, visible in the centre of the dial, transmits, independently, the energy of the barrel spring towards the two secondary gear trains. Each sec-ondary gear train is equipped with a Remontoir d’Egalité of a frequency of 1 second. Working in such a way, the force received by the escapements remains linear and assures isochronism throughout 28 hours.
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Click, to see the large size. ▶ BIG FOTO
On the movement side, 2 «Remontoirs d’Égalités» (constant-force device) provide a linear force to each of the two balance springs to remain isochronous during 28 hours.
This model is available with a case in Platinum or in 18K 6N Gold in 40 or 42 mm diameter. The dial is proposed in 18K white or 6N Gold with 2 hour subdials in whitened Silver Guilloché clous de Paris. Leather strap or Gold or Platinum bracelet.
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TECHNICAL CHARACTERISTICS
Collection: CLASSIQUE
Model: Chronomètre à Résonance Double Time
Movement
Calibre 1520 in 18 K rose Gold
Manual winding / 31 turns of crown
Dimensions
Overall diameter: 34.60 mm
Casing-up diameter: 34.20 mm
Overall height: 7.97 mm
Height of winding stem: 3.39 mm
Diameter of stem thread: S1.20 mm
Number of parts_
Movement: 378
Cased up with strap: 427
Jewels: 62
Balance
- 2 Independent linear escapements, 15 teeth
- 2 Independent balances with 4 inertia weights
- 2 Flat micro-flamed Anachron balance springs
- 2 Mobile stud carriers
- 2 Springs laser pinned to Nivatronic collets
- 2 Pinned GE studs
Inertia: 10.10 mg*cm 2
Angle of lift: 52°
Amplitude: 0 h dial up: > 260° / 24 h dial up: > 260°
Main Characteristics_
- 2 Remontoirs d’Égalités
- 2-position winding crown at 2h
Time adjustment in position 2: clockwise for the left dial and anti-clockwise for the right dial
Resetting the seconds to zero by pulling the crown at 4h
Indications
Double time display:
- Left analog - indicating 24 hours
- Right analog - indicating 12 hours
- 2 small seconds at 6h
- Power reserve at 12h
42 hours
Efficient running time: 28 hours ± 2
Finishing
High quality
Partial circular graining on baseplate
Geneva waves on bridges
Screw heads polished and beveled, with chamfered slots
Pegs with polished rounded ends
Steel components hand-finished
Dial
18K white or 6N Gold and whitened Silver hour dials with guilloché clous de Paris
Case
Platinum or 18 K 6N Gold
Diameter: 40 or 42 mm
Total height: 11 mm
Strap
Alligator straps
Pin Buckle
Gold or Platinum bracelet.
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Press release - 2020
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MONTRES JOURNE SA
Brigitte Bocquet-Makhzani - Communication
International PR & Events Manager
17, rue de l’Arquebuse – 1204 Geneva – Switzerland
Tel : +41 (0)22 322 09 09
Fax : +41 (0)22 322 09 19
e-mail: bmakhzani@fpjourne.com
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