Quadruple Tourbillon à Différentiel Sphérique – Second eXperimental watch®.
Shifting into top gear
Since its presentation in the form of an eXperimental prototype at Baselworld 2005, the Quadruple Tourbillon à Différentiel Sphérique has entered its fine-adjustment phase, after successfully undergoing numerous important tests that led to the approval of the
central Spherical Differential system, an invention made by Greubel Forsey and which has proved essential in increasing the power of their inventions in general.Necessary asymmetry
The first major challenge encountered by Greubel Forsey in the construction of the Quadruple Tourbillon à Différentiel Sphérique was to place four rotating carriages inside a wristwatch that is nonetheless perfectly wearable in terms of size and appearance.In order to harmoniously integrate the entire set of these four Tourbillons and the Spherical Differential while maintaining total visual access to all these key mechanisms, the unusual approach chosen was to place the two double-carriage systems in an asymmetrical format, with one of the two systems positioned just partially outside the circumference of the mainplates. The immediate advantage of this movement structure is the immediate visibility of the four carriages on the dial side, as well as an interesting lateral view. On the movement side, a surprise awaits the observer: at the heart of the stunningly sophisticated array of multiple mechanisms, the Spherical Differential can be seen exercising its central role.Technical splendours
The purists' approach dear to Greubel Forsey is reflected in the design of the Quadruple Tourbillon à Différentiel Sphérique's exterior which clothes the highly complex movement. The outward expression of the asymmetrical mechanisms is particularly obvious through the lateral opening enabling one to admire the exquisite choreographed motion of Tourbillons 1 and 2, while Tourbillons 3 and 4 are clearly visible through the cross-ways openings in the double plate. This architecture made it possible to keep the same case size as the Double Tourbillon 30° at 43.5 millimetres.Balanced forms
The quest for a necessarily delicate balance is achieved through a dedicated dial design and an original arrangement of the display with a coaxial indication of the power reserve on a sector and the small seconds by means of a double-ended hand.The four-minute rotation of the two large carriages is displayed on the graduated left-hand segment. Presented at Baselworld 2005 in the form of an eXperimental prototype, the Quadruple Tourbillon à Différentiel Sphérique is still undergoing its key EWT® validation process, which should mean the first watches can be delivered in 2008.The patience of those who have followed this development from the start will be amply rewarded: they will at last have access to an exceptional timepiece embodying an impressive sum of the most cutting-edge knowledge available in the field of technical Haute Horlogerie.
Since its presentation in the form of an eXperimental prototype at Baselworld 2005, the Quadruple Tourbillon à Différentiel Sphérique has entered its fine-adjustment phase, after successfully undergoing numerous important tests that led to the approval of the
central Spherical Differential system, an invention made by Greubel Forsey and which has proved essential in increasing the power of their inventions in general.Necessary asymmetry
The first major challenge encountered by Greubel Forsey in the construction of the Quadruple Tourbillon à Différentiel Sphérique was to place four rotating carriages inside a wristwatch that is nonetheless perfectly wearable in terms of size and appearance.In order to harmoniously integrate the entire set of these four Tourbillons and the Spherical Differential while maintaining total visual access to all these key mechanisms, the unusual approach chosen was to place the two double-carriage systems in an asymmetrical format, with one of the two systems positioned just partially outside the circumference of the mainplates. The immediate advantage of this movement structure is the immediate visibility of the four carriages on the dial side, as well as an interesting lateral view. On the movement side, a surprise awaits the observer: at the heart of the stunningly sophisticated array of multiple mechanisms, the Spherical Differential can be seen exercising its central role.Technical splendours
The purists' approach dear to Greubel Forsey is reflected in the design of the Quadruple Tourbillon à Différentiel Sphérique's exterior which clothes the highly complex movement. The outward expression of the asymmetrical mechanisms is particularly obvious through the lateral opening enabling one to admire the exquisite choreographed motion of Tourbillons 1 and 2, while Tourbillons 3 and 4 are clearly visible through the cross-ways openings in the double plate. This architecture made it possible to keep the same case size as the Double Tourbillon 30° at 43.5 millimetres.Balanced forms
The quest for a necessarily delicate balance is achieved through a dedicated dial design and an original arrangement of the display with a coaxial indication of the power reserve on a sector and the small seconds by means of a double-ended hand.The four-minute rotation of the two large carriages is displayed on the graduated left-hand segment. Presented at Baselworld 2005 in the form of an eXperimental prototype, the Quadruple Tourbillon à Différentiel Sphérique is still undergoing its key EWT® validation process, which should mean the first watches can be delivered in 2008.The patience of those who have followed this development from the start will be amply rewarded: they will at last have access to an exceptional timepiece embodying an impressive sum of the most cutting-edge knowledge available in the field of technical Haute Horlogerie.
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