在15世纪早期，人们发明了螺旋弹簧或均力圆锥轮，尽管它的主弹簧的张力不断变化，但仍能对计时装置的齿轮保持恒定的力。
In the early 1400s came the invention of the coiled spring or fusee which maintained constant force to the gear wheels of the timekeeper despite the changing tension of its mainspring.
调弱挑线弹簧的张力，调大动作行程。
Decrease the tension and increase the stroke of the thread take-up spring.
精益克制可调弹簧的张力滑动的黑夹子沿黄色底前管。
Lean restraint springs are adjustable in tension by sliding the black clamps along the yellow front bottom tube.
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