英语词汇“royal pendulum”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	royal pendulum
释义	royal pendulum Clockmaking (now chiefly historical ) noun A pendulum having a period of one second, given by a length of 39.14 in (99.42 cm). Such pendulums were used from the late 1660s in English long-case clocks, much improving the timekeeping over earlier, shorter pendulums.. Origin Late 17th century.
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royal pendulum