Quartz clock
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Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. The crystal oscillator, controlled by the resonant mechanical vibrations o
A basic analog quartz clock
Modern quartz wristwatch
Circuit board of an e block from a chronograph-wristwatch. The quartz crystal oscillator can be seen on right.
Disassembled analog quartz clockwork; quartz crystal oscillator (top left), Lavet-type stepping motor (left) with a black rotor sprocket and connected white and transparent gears (right). These gears control the movement of the second, minute and hour hands.
Chronometer watch
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A chronometer is an extraordinarily accurate mechanical timepiece, with an original focus on the needs of maritime navigation. In Switzerland, timepieces certified by the Contrôle Officiel Suisse des
A 1928 Movado Ermeto mechanical chronometer.
Marine sandglass MMM