A Lange and Sohne has launched a new Cabaret tourbillon watch model with a stop seconds feature.
In 1997, the Lange CABARET watch amazed the world with its elegant rectangular shape that evoked the luxury, charisma, and perfection of the Art Deco epoch. Eleven years after the launch of its predecessor, the CABARET TOURBILLON by A. Lange & Söhne now sets the stage for a world debut starring the balance in a rotating carriage. For the first time ever, the tourbillon has been tamed with a stop-seconds mechanism.
The Lange CABARET TOURBILLON watch is equipped with the manual-wound Lange manufacture calibre L042.1 that incorporates a tourbillon mechanism with stop seconds feature, the emblematic outsize date display and the power reserve indictor.
An ingenious idea inspired the development of the carriage escapement for which a patent was filed in 1801. It was predestined for pocket watches that were typically slipped into a vest pocket in the same upright orientation. In the tourbillon, the rate-governing parts – the balance and escapement assemblies – were integrated in a cage that rotated about the fourth wheel. This neutralised the position error caused by the pull of gravity on the balance wheel which can never be poised with absolute perfection, resulting in greater rate accuracy.
Until this date, no one so far invented a device that would make it possible to instantaneously and precisely stop and restart a tourbillon watch for synchronisation purposes. Finally, the calibre designers at Lange finally found a solution for stopping the entire tourbillon cage mechanically from within the movement.
With this rather simple approach, the balance wheel would slow down and eventually coast to a halt. It would need to be “kick-started” to resume its reciprocating motion. This unsatisfactory approach was rejected. To preserve the potential energy of the balance spring during the braking process, the only viable alternative was to directly and instantaneously brake the balance wheel inside the cage itself. This was the only way to assure that the balance wheel would immediately begin to oscillate again after the “brake” had been released.
But how can the oscillating balance wheel of a tourbillon escapement be stopped in a rotating cage, especially because one of the three cage posts is in the way every 20 seconds?
Until recently, this problem had frustrated all specialists involved with tourbillon escapements, leaving it up to Lange’s engineers to find an answer more than two centuries after the invention of the tourbillon. Their solution in brief: pulling the crown initiates a complex linkage motion that causes a stop lever with two bent, V-shaped spring arms to contact the outer rim of the balance wheel, stopping it immediately.
This intervention could potentially be foiled when one arm of the V-shaped braking spring happens to land on one of the three posts of the tourbillon cage. For this reason, the delicate two-armed steel spring is hinged at a rotation point of the brake lever. In other words, even if one arm of the spring is resting against the cage post, the other one will still advance to the balance wheel rim and stop it just as reliably as if both arms had engaged.
The asymmetrically curved shapes of the two spring ends were empirically determined in extensive tests. Their special geometry assures that the contact pressure they exert is optimised in all conceivable positions of the brake spring relative to the balance wheel.
Additionally, the ends of the brake spring are bent so that they cannot accidentally engage when the balance wheel is arrested and released. So this is not only an intelligent complication aesthetically showcased on the dial side of the CABARET TOURBILLON, it is also a useful innovation commensurate with Lange’s heritage. The patented invention finally makes it possible to precisely measure the improved rate accuracy of the tourbillon.
The twin mainspring barrel of the newly developed, manually wound calibre L042.1 movement has a power reserve of five days or 120 hours when fully wound. A power-reserve indicator at 4 o’clock dependably reminds the owner when it is time to transmit fresh energy to the masterpiece.
Beneath the 12, the famous Lange outsize date forms a visual equilibrium with the tourbillon exposed in a dial aperture. The form movement is crafted and finished to the highest Lange quality standards.
The lavishly decorated three-quarter plate made of untreated German silver is accented by six screwed gold chatons. Three further chatons are located on the hand-engraved intermediate-wheel and tourbillon cocks as well as on the specular-polished tourbillon bridge on the dial side.
The pivots of the balance-wheel staff are suspended between two diamond endstones. Accompanying 45 ruby jewels, these diamonds stand for horological excellence and are reminiscent of the peerless 1A quality pocket watches once produced by Lange.
A. Lange & Söhne Cabaret Tourbillon watch is available in pink gold and platinum versions. Measuring 29.5 x 39.2 mm, the rectangular case provides a classy setting for the world debut of the first stop-seconds tourbillon.
Model: A. Lange & Söhne Cabaret Tourbillon
Ref. 703.025: CABARET TOURBILLON Platinum
Ref. 703.032: CABARET TOURBILLON Pink Gold
Lange manufacture calibre L042.1, manually wound, crafted to the highest Lange quality standards and largely assembled and decorated by hand; precision adjusted in five positions; three quarter plate made of untreated German silver; Lange outsize date; intermediate-wheel and tourbillon cocks engraved by hand; Number of parts: 373, of which tourbillon: 84; Jewels: 47, of which 2 diamond end stones; Screwed gold chatons: 9
Movement dimensions: 22.3 x 32.6 x 6.35 millimetres
Escapement: Lever escapement; Balance: Shock-resistant glucydur screw balance, balance spring manufactured in-house with a frequency of 21,600 semi-oscillations per hour, whiplash precision index adjuster with patented beat adjustment mechanism Power reserve: 5 days (120 hours) when fully wound.
Time indicated in hours, minutes, small seconds; power reserve indicator; one-minute tourbillon with patented stop seconds
Crown for winding the watch and setting the time, date correction push-piece at 2 o’clock (recessed)
Case dimensions: 29.5 x 39.2 x 10.25 millimetres
Material: Platinum or pink gold
Glass and case-back: Sapphire crystal (hardness 9)
Solid silver, rhodié or argenté
Rhodiumed gold or Pink gold hands
Hand-stitched crocodile strap buckle in platinum or pink gold
Image Credit: Lange Uhren GmbH