IWC Schaffhausen ingenieur constant-force tourbillon Mode D'emploi page 18

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t h e t e C h n I C a l r e F I n e M e n t s o F t h e I n g e n I e u r
C o n s t a n t - F o r C e t o u r b I l l o n
Your IWC watch shows you the time in hours, minutes and seconds, together with
the moon phases in both hemispheres, the time left until the next full moon and the
power in reserve. The mechanical movement with automatic winding has a power
reserve of approximately 96 hours when fully wound. Your Ingenieur Constant­Force
Tourbillon is protected by a sapphire glass of hardness grade 9 on Mohs' scale. Your
watch is water­resistant 12 bar. Furthermore, it is equipped with a minute tourbillon, a
unique micro mech anism, which minimizes the effect of gravity on the rate precision.
The constant­force mechanism, which is housed directly in the tourbillon, ensures
consistent amplitude over at least 2 days. This is indicated by the one­second jumps
of the seconds hand in the tourbillon. If the energy in the two barrels is insufficient
to maintain the constant­force mechanism, the watch rate automatically switches to
2.5 Hertz. This can be seen in the fact that the seconds hand on the tourbillon is now
moving constantly. This rate corresponds to that of a standard tourbillon.To ensure
that this extraordinary watch continues to perform faultlessly in the future, it is essen­
tial to observe a few important operating instructions.
I n g e n I e u r C o n s t a n t - F o r C e t o u r b I l l o n