89天:【小牛顿-人文历史】探访“时间”的奥秘(下)
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Manage episode 169452583 series 1282034
用重锤驱动的塔钟只能架在塔上,或是高挂在墙上,人们外出时就无法得知时刻。慢慢的,人们用发条来取代重锤,又设计出完善的表用调速器,进而发明可以随身携带的表。调速器有个精密的平衡发条,又称“游丝”,一卷一伸,使得平衡轮来回转动带动托铁,托铁以一定的频率与冠状齿轮接合或脱离,因此可以计算出时刻。
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