Clocks By Bneuenschwander 200 BCE Water Powered Escapement Mechanism Clock Feb 1, 900 Mercury Powered Escapement Mechanism Clock Feb 1, 1000 Water Clock using gears Jan 1, 1206 Candle Clock Feb 1, 1300 First Mechanical Clocks Feb 1, 1600 First Pocket Watches Jan 1, 1656 Pendulum Clock Feb 1, 1930 Quartz Oscillators Invented Feb 1, 1950 Atomic Clock Feb 1, 1980 Quartz Clocks Become Dominant