Audemars Piguet Calibre 2910 Instructions for use manual - page 12
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Eng
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Power reserve
Calibre 2910 has a power reserve of 165 hours (about
7 days).This endurance is achieved by a large-diameter,
dual barrel system developed by Audemars Piguet,
with a blocking mechanism guaranteeing optimum
performances.
Energy at its best
The fast-rotating, dual barrel system - with revolutions
limited to 19.75 - guarantees a constant force during
the seven-day running time, hence improved efficiency
and chronometry. In reality the two barrels fitted in
parallel produce a power reserve of nine days. But an
ingenious blocking system - in the high (C-D, see graph
below) and low (A-B, see graph below) load zones -
concentrates the watch rate on the seven median
running days, with the most regular (B-C, see graph
below) providing optimum efficiency.
The 19.75 winding revolutions on each barrel - far
higher than standard - are possible by using a
particularly fine spring. This specific feature transmits
the energy far more gently and regularly to the wheels,
thus ensuring greater rate accuracy and reliability.
Tremendous operating accuracy
The blocking system
A parallel barrel system
• Reduced pressure in the gears
• Barrel spring friction used to cancel out any force
variations
Series system
Parallel system (AP)
Position of the gears when
fully wound
Position of the gears 3 days
before stopping
Position of the gears when stopped
1 jour
7 jours
1 jour
1 day
7 days
1 day
1 Tag
7 Tage
1 Tag
1 giorno
7 giorni
1 giorno
1 día
7 días
1 día
1
день
7
дней
1
день
1
日
7
日
1
日
1
天
7
天
1
天