Drawing on its pocket watch history, A. Lange & Söhne combines the chain and fusee with a tourbillon in its new Tourbograph   B Y   E L I Z A B E T H   D O E R R     Who knows what a chain and fusee are? If you just raised your hand or nodded your head, then go to the head of the class. This is, after all, a vintage technology that has only been utilized in one particular wristwatch since the end of the pocket watch era.   Until now, that is Let's get technical for a second. The mainspring, which is the component that stores and passes energy on to the rest of the movement, can influence the movement's degree of precision, depending on how it is tensioned. Experts agree that in order to have constant precision, the mainspring would need a continuous degree of tension all the time. This is the reason that constant-force mechanisms were developed.     The Tourbograph alongside 1994's Tourbillon Pour le Mérite (left).

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