The evolution of time measurement, Part 2: quartz clocks [Recalibration]

Quartz clocks are the most common timekeepers of all. Billions of quartz oscillators are manufactured annually for use inside clocks, watches, mobile phones, computers, radios, and televisions. In this article, Part 2 of a five-part series, I discuss the evolution of quartz clocks, beginning with the discovery of piezoelectricity.