LITTLE ROCK — You might have one on your wrist or your bedside table. There is one in your cell phone and your GPS receiver. Every laptop and desktop computer has one, and there could be more than one ...

The familiar tick-tock of wall clocks originates from the escapement mechanism, which controls gear movement in precise steps ...

The tick-tick sound comes from the movement of gears and parts inside the clock. In mechanical clocks, a part called the ...

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 ...