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Marque :
Jaeger-LeCoultre
Collection :
Etrier
Modèle :
Etrier
Catégorie :
Horloge
Période :
1980's
Mouvement :
Automatique
Matière boîtier :
Acier
Forme du boitier :
Rond
Avec diamand :
Oui :
Couleur cadran :
Beige
Détail référence :
NUMBER 3 215 006 ,
Complications :
Tourbillon
Description :
Jaeger-LeCoultre, Swiss, Highly Important & Unique Triple.Flying Tourbillon Prototype Clock, Ref. No. 3-215-006, circa.1980.Case: Étrier form, polished, brushed and rhodium plated, glazed on.both sides, matte with polished faceted base, slotted top, 153 mm x.113 mm.Dial: polished and rhodiumed baton hands moving between the.glasses.Movement: modified 8 day caliber 250, frosted gilt, going train.arranged in a straight line in a bar frame, flying tourbillon.carriage held in a single ball-bearing, lateral 70 degree lever.escapement with the pallet fork mounted also in a single ball.bearing and the escape wheel in a single jewel, monometallic.balance controlled by a self-compensating Breguet balance.spring.Signed: signed on the case, dial and movement.The clock is revolutionary in its design. It is the first known.flying tourbillon run in ball bearings with two additional.flying components - the pallet fork and the escape wheel - a.triple flying tourbillon. Both the escape wheel and the pallet.fork run in a single bearing, the fork in ball bearing, the wheel.in a double-jewel bearing. The other ends are free, or flying, as.named by their inventor, Albert Helwig (1886-1974), who was the.technical director of the Deutsche Uhrmacherschule..This design was later implemented in one form or other in some of.the most important flying tourbillon's, such as IWC's Da Vinci.the most complicated of them all, and Dunand, Vulcain, which made a.stunning entry at the Basel Fair, and more..With the advent of modern tourbillon's, improved solutions were.necessary, either making the watch thinner or improving the.function and assembly. Assembling a carriage in a regular.tourbillon is difficult and risky because the escape wheel bridge.obstructs fitting the carriage. This led to many broken carriage.arbors. The design of this clock allows for thinner movements and.simplifies the assembling..The clock appears to be the first tourbillon addressing and.eliminating this problem by introducing a free-end (flying) escape.wheel and free end pallet fork. Here, unlike in other tourbillon's.the escape wheel pinion slips into the engagement with the.tourbillon's stationary wheel, eliminating the risk of damage..With the modern fascination with tourbillon's, some manufacturers.notably Lange, IWC, and a few others, have worked on new designs.for production-type tourbillon's - ones wherein the carriage.rotates only around one end of its arbor, and in others appears.flying in the air. A new method was needed for its bushing, a.constant problem for the few makers (Holland 1902, North 1903.Helwig 1924, and a few others) daring enough to make flying.tourbillon's in the past. The logical solution was to implement.ball-bearings already used in self winding mechanisms, known in.rough form since 1929. However, the precision required in.tourbillon's was much higher, requiring special lubrication.precautions, and therefore difficult to assemble..Ultimately the industry succeeded, resulting in some of the most.stunning flying tourbillon wristwatches. The concept's humble.beginning started with this clock. The Étrier (Stirrup) model was.designed by Jaeger-LeCoultre in 1933. At that time, it ran on.caliber 201, a typical circular movement hanging on a leather.ribbon from the stirrup's slot. With the development of the caliber.210 in 1938, the Étrier model began its present skeletonized form..Caliber 250, an improved version of the 210, was introduced in.1979. The present example must be from the early series, since.subsequent 250's were rhodium plated.
