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.
随便看	mother kirk motherland Motherland Party mother language motherless motherlessness motherliness mother liquid mother liquor mother lode mother love mother-loving motherly Mother Midnight mother mold mother mould mother-naked mother nation Mother Nature mother of all —— mother of cloves Mother of God mother of millions Mother of Parliaments mother-of-pearl

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royal pendulum