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Key terms: clock pendulum swings pendulum clocks escapement rod train vary dial gravity minute styles quartz accurate regulator drag invention adjustment accuracy huygens galileo mechanism precision horology per day strikes impulse timekeeping pushes gear train rotating wheel train minute hand gravity arm slave clock astronomical complication keep time blade spring observatories george graham clockmaker pendulum swings quartz clock pendulum rod most accurate longcase clock simple pendulum free pendulum clock pendulum clocks must Search external links cited by footnotes on Wikipedia page Pendulum clock: |
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