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A. Lange & Söhne Richard Lange Tourbillon

leicaphile

Panerai
Har inte sett den här nämnas än -- har jag bara missat tråden? Fantastiskt fin och vilket hantverk!

http://www.hodinkee.com/blog/introducing-a-lange-sohne-richard-lange-tourbillon-pour-le-merite

Speaking of mechanisms, the manufacture caliber L072.1 is a manually wound, hand-assembled art piece that can beat for 36 hours at 21,600 vph. It has a patented stop seconds mechanism that allows precise setting. It also has a fusée and chain transmission.

As logic dictates, the mainspring's power is very high when it's fully wound and very weak when it's unwound. Going from wound to unwound (more power output in the beginning and less power output toward the end) results in obvious fluctuations in accuracy.

What the fusée and chain transmission aim to do is equalize the force of the mainspring throughout the duration of its unwinding – thereby giving the movement a constant quantity of energy, and keeping the watch running at a continual rate.

How does it do this, you ask? The fusée is a cone-shaped object with helical grooves on its lateral surface (smaller cone at the top, and larger at the bottom). A fully wound spring will tug at the top of the cone. A less wound spring will eventually tug at the bottom. Thus, as the spring grows weaker, the “lever” grows longer. Another series of rivets, levers, and blockers ensure that the fully wound and fully unwound state are blocked, thereby securing only that harmonious, constant middle. This is no easy task – the movement has 351 parts, and the chain has 636 with a cross section measuring in at 0.6 by 0.3 mm.

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