The sesame chain drive system interconnects the mainspring barrel and its pagoda wheel with a long, thin, bicycle-like chain called a sesame chain. In other words, the sesame chain is a device that makes the power output of the barrel smoother, and it was adopted by watchmakers to make mechanical watches run more accurately.
The sesame chain of a pocket watch operates on the principle of the lever fulcrum discovered by Archimedes: when the mainspring is fully wound and operating at full power, the sesame chain pulls on the lever of the tiny circumference, the pagoda wheel. When the mainspring is weakened, the sesame chain pulls on the larger circumference of the pagoda wheel.
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