Watch

wristwatchwatchesdigital watchwristwatcheswrist watchluxury watchwatch casedigital watcheswrist watchesdial
A watch is a timepiece intended to be carried or worn by a person.wikipedia
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War Office

War DepartmentBritish War OfficeOld War Office Building
The War Office began issuing wristwatches to combatants from 1917.

Automatic watch

automaticself-windingself-winding watch
The first successful self-winding system was invented by John Harwood in 1923.

John Harwood (watchmaker)

John Harwood
The first successful self-winding system was invented by John Harwood in 1923.

Resonator

resonant cavityresonatorscavity resonator
In place of a balance wheel which oscillated at perhaps 5 or 6 beats per second, it used a quartz crystal resonator which vibrated at 8,192 Hz, driven by a battery-powered oscillator circuit.

Electronic oscillator

oscillatoroscillatorsaudio oscillator
In place of a balance wheel which oscillated at perhaps 5 or 6 beats per second, it used a quartz crystal resonator which vibrated at 8,192 Hz, driven by a battery-powered oscillator circuit.

Skeleton watch

Skeleton watches are designed to leave the mechanism visible for aesthetic purposes.

Pendulum

pendulumssimple pendulumpendula
A mechanical movement also uses a balance wheel together with the balance spring (also known as a hairspring) to control the motion of the gear system of the watch in a manner analogous to the pendulum of a pendulum clock.

Pendulum clock

regulator clockClock pendulumregulator
A mechanical movement also uses a balance wheel together with the balance spring (also known as a hairspring) to control the motion of the gear system of the watch in a manner analogous to the pendulum of a pendulum clock.

Gravity

gravitationgravitationalgravitational force
The tourbillon, an optional part for mechanical movements, is a rotating frame for the escapement, which is used to cancel out or reduce the effects of gravitational bias to the timekeeping.

Georges Frederic Roskopf

Roskopf
The pin-lever escapement (called the Roskopf movement after its inventor, Georges Frederic Roskopf), which is a cheaper version of the fully levered movement, was manufactured in huge quantities by many Swiss manufacturers as well as by Timex, until it was replaced by quartz movements.

Hertz

MHzkHzHz
Introduced by Bulova in 1960, they use a tuning fork with a precise frequency (most often 360 hertz) to drive a mechanical watch.

Ratchet (device)

ratchetratchetingpawl
The back-and-forth motion of the winding rotor couples to a ratchet to wind the mainspring automatically.

Quartz

rock crystalquartz crystalcitrine
In the 1960s the electronic quartz watch was invented, which was powered by a battery and kept time with a vibrating quartz crystal. Electronic movements, also known as quartz movements, have few or no moving parts, except a quartz crystal which is made to vibrate by the piezoelectric effect.

Crystal

crystallinecrystalscrystalline solid
Electronic movements, also known as quartz movements, have few or no moving parts, except a quartz crystal which is made to vibrate by the piezoelectric effect.

Piezoelectricity

piezoelectricpiezoelectric effectpiezo-electric
Electronic movements, also known as quartz movements, have few or no moving parts, except a quartz crystal which is made to vibrate by the piezoelectric effect.

Rolex Oysterquartz

In 1970, 18 manufacturers exhibited production versions of the beta 21 wristwatch, including the Omega Electroquartz as well as Patek Philippe, Rolex Oysterquartz and Piaget.

Omega Marine Chronometer

The first quartz watch to enter production was the Seiko 35 SQ Astron, which hit the shelves on 25 December 1969, swiftly followed by the Swiss Beta 21, and then a year later the prototype of one of the world's most accurate wristwatches to date: the Omega Marine Chronometer.

Oscilloquartz

Oscilloquartz SA
For quartz wristwatches, subsidiaries of Swatch manufacture watch batteries (Renata), oscillators (Oscilloquartz, now Micro Crystal AG) and integrated circuits (Ebauches Electronic SA, renamed EM Microelectronic-Marin).

EM Microelectronic-Marin

For quartz wristwatches, subsidiaries of Swatch manufacture watch batteries (Renata), oscillators (Oscilloquartz, now Micro Crystal AG) and integrated circuits (Ebauches Electronic SA, renamed EM Microelectronic-Marin).

Spring Drive

Seiko Spring DriveSpring drive watch
Seiko's efforts to combine the quartz and mechanical movements bore fruit after 20 years of research, leading to the introduction of the Seiko Spring Drive, first in a limited domestic market production in 1999 and to the world in September 2005.

Japan

🇯🇵JPNJapanese
In 2010, Miyota (Citizen Watch) of Japan introduced a newly developed movement that uses a 3 pronged quartz crystal that was exclusively produced for Bulova to be used in the Precisionist or Accutron II line, a new type of quartz watch with ultra-high frequency (262.144 kHz) which is claimed to be accurate to +/- 10 seconds a year and has a smooth sweeping second hand rather than one that jumps each second.

Time transfer

time referencecommon-view GPStime information
Radio time signal watches are a type of electronic quartz watch which synchronizes (time transfers) its time with an external time source such as in atomic clocks, time signals from GPS navigation satellites, the German DCF77 signal in Europe, WWVB in the US, and others.

Atomic clock

atomic clocksatomiccaesium clock
Radio time signal watches are a type of electronic quartz watch which synchronizes (time transfers) its time with an external time source such as in atomic clocks, time signals from GPS navigation satellites, the German DCF77 signal in Europe, WWVB in the US, and others.

Leap year

leap yearsbissextileleap day
Movements of this type may—among others—synchronize the time of day and the date, the leap-year status and the state of daylight saving time (on or off).

Daylight saving time

DSTPSTdaylight saving
Movements of this type may—among others—synchronize the time of day and the date, the leap-year status and the state of daylight saving time (on or off).