So a pendulum one meter long has a period of about two seconds.
因此1米长的钟摆，所用周期是2秒。
Well-run pendulum clocks in the 1660s differed by only about 15 seconds a day. Non-pendulum clocks of the same era (ones that used rotating wheels) varied by about 15 minutes a day.
在17世纪60年代，一台运行良好的摆钟一天的误差只有15秒，而同时期的非摆钟的钟表(即采用回转轮的钟表)运行一天则有15分钟的误差。
Balthazar's Pendulum: decreased duration to 5…10 seconds.
巴萨泽的震荡：减少持续时间至5。.10秒。
钟摆摆动计秒。
You can experiment with it if you wish; and perhaps you can find out how long a pendulum must be to vibrate once in two seconds.
假如愿意的话，你可以用它来做试验，也许你就会算出，钟摆每两秒钟摆动一次的摆长应该是多少。
钟摆来回地摆动。
钟摆来回地摆动。
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