We were pleasantly surprised by the Le’raze Grandfather Wall Clock’s elegant appearance and modern components. The clock’s quartz movement kept time accurately, and the pendulum added a nice ...

In keeping time, pendulum can’t keep up with quartz March 2, 2010 at 3:46 a.m. by MARSHALL BRAIN MCCLATCHY NEWSPAPERS ...

THE most accurate timekeepers of to - day are divided into two classes, depending on whether the restoring force of the oscillator is gravity, as in pendulum clocks, or elasticity, as in quartz ...

But even the best mechanical pendulums and quartz crystal-based clocks develop discrepancies. Far better for timekeeping is the natural and exact "vibration" in an energized atom.