Linkages scissored from the twirling pendulums slide up a sleeve on the pole, levering a valve which controls the speed of rotation by adjusting the steam.

• 与旋转的摆成剪状交叉的联动装置把柱子上的滑动套筒顶起，扳动一个阀门，一个通过对蒸汽进行调整从而控制旋转速度的阀门。