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Arnold and Son - Constant Force Tourbillon

Arnold & Son offers another preview of the novelties that will be unveiled at Baselworld 2015 with the amazing Constant Force Tourbillon, featuring a patented constant force device with 60-second tourbillon and true beat seconds.

At the top of the eye-catching dial, two visible mainspring barrels and the constant force device provide optimal power to the tourbillon at the bottom of the dial.

The bridges supporting the constant force regulator and tourbillon are symmetrical, both horizontally with each other and vertically with the barrel bridges. This movement architecture pays tribute to Arnold & Sons' historic marine chronometers.

To maximise power consistency in the Constant Force Tourbillon, Arnold & Son did not integrate just one mainspring barrel, which would produce significantly different amounts of torque between fully wound and nearly empty, but two symmetrical barrels in series, visible on the dial side at 10:30 and 1:30.

The first mainspring barrel alone powers the gear train, while the second barrel tops up the first whenever its torque output drops below optimal. This ensures that the power to the regulator flows as constantly as possible for higher precision.

Instead of directly feeding the escapement/tourbillon, The mainspring charges a small hairspring which in turn releases a consistent amount of power to the escapement/tourbillon once each second.

This patented device also drives the true-beat seconds hand (also known as dead seconds).

When the power from the mainspring drops below that required by the constant force mechanism, the movement stops rather than running at lower precision. The constant force device rotates once per minute in increments of one second, visually mirroring the rotation of the constantly rotating tourbillon cage.

The precision of the watch is further enhanced by the 60-second tourbillon which averages out gravitational errors on the escapement by constantly rotating it through 360°.

The hand wound mechanical movement has a power reserve of 90 hours and beats at 21,600 vibrations per hour. Finishing is typical of Haute Horlogerie standards: hand-chamfered bridges with polished edges and brushed surfaces, screwed gold chatons, screws with bevelled and mirror-polished heads.

The Arnold & Son Constant Force Tourbillon is a limited edition of 28 timepieces, and is available in a 46 mm red gold case with anti-reflective sapphire crystal and sapphire display back for viewing the hand-finished movement. Price: Swiss Francs 174,900 without local taxes.

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