Pendulum clock Wikipedia
A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is a harmonic oscillator: it swings back and forth in a precise time interval dependent on its length, and resists swinging at other its invention in 1656 by Christiaan Huygens until the 1930s, the pendulum clock was the world''s most ...