Definition of quartz clock in English:

quartz clock

noun

单词	quartz clock
释义	Definition of quartz clock in English: quartz clock noun An electric clock in which the current is regulated and accuracy maintained by the regular vibrations of a quartz crystal. Example sentencesExamples A major advance was the printed screen which gave a much larger target area, but it took the transistor, quartz clock and integrated circuit for chronographs to move out of the ballistic laboratory to the range. It was in that year that the original quartz clock was invented by W.A. Marrison and J.W. Horton. The first person to build the quartz clock was a Canadian born engineer, Warren Marrison of Kingston, Ontario. The quartz clock was so accurate and reliable, that already by 1939 it had replaced the mechanically-regulated clocks at the Observatory in Greenwich. Because they have no gears or escapements to disturb their regular frequency, quartz clocks are extremely accurate and have become the dominant timekeeping technology.
随便看	catastrophically catastrophically catastrophise catastrophiser catastrophising catastrophism catastrophist catastrophist catastrophists catastrophize catastrophizer catatonia catatonias catatonic Catawba Catawba River cat-band cat-bear catbird catbirds catboat catboats cat burglar cat burglars cat cafe