Barrel one, Barrel two

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Hi. Can anyone explain HOW the two barrels work separately or together to keep accurate time when winding down? How does the spring sit there?
Are there 30 hours of power in barrel one and when that's depleted, barrel two's 30 hours are triggered somehow?
Of course we're talking about the 8900 series of movements.
 
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There are two Spring barrels which are mounted in series that release the energy from the Mainsprings together in series.
This results in a more even delivery of torque to the escapement as the Mainsprings unwind across a longer period of time than a single Mainspring/barrel can.
 
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The two barrels, for the most part, wind and unwind in parallel.

Cheers, Al
 
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The two barrels, for the most part, wind and unwind in parallel.

Cheers, Al

Thanks for the clarification Al👍
I always thought I had seen something about it somewhere that they were in series::facepalm1::