At this point the weight of the water remaining in the scoop turned the drive wheel, which in turn drove a train of gears to synchronously turn the observational armillary sphere on the top level of the tower, the demonstrational celestial globe on the middle level, and the timekeeping system inside the bottom level.
此時受水壺中剩餘的水的重量，會帶動樞輪轉動，樞輪再帶動齒輪，齒輪帶動上層的渾儀、中層的渾象，以及下層的報時系統同步運轉。