A quartz clock is a clock that uses an electronic oscillator that is regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks are at least an order of magnitude more accurate than mechanical clocks.
Quartz clock
Quartz clock
quartz clock
Galileo quartz clock
Quartz clocks of the Greenwich Time Service
Quartz Clocks Synchronized by LF Time Signals
Electronic quartz clock with integrated circuits
DESIGN OF THE MOULD FOR THE QUARTZ CLOCK GEARS
Performance of rubidium and quartz clocks in space
Atomic and Quartz Clock Hardware for Communication and Navigation Satellites
The Short-period Erratics of Free Pendulum and Quartz Clocks
The evolution of time measurement, Part 2: quartz clocks [Recalibration]
On-orbit frequency stability analysis of the GPS NAVSTAR-1 quartz clock and the NAVSTARs-6 and -8 rubidium clocks
