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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Automatic quartz

automatic power generating quartz watchkinetic-powered quartz watches
For instance, Seiko's kinetic-powered quartz watches use the motion of the wearer's arm: turning a rotating weight which causes a tiny generator to supply power to charge a rechargeable battery that runs the watch.
Automatic quartz is a collective term describing watch movements that combine a self-winding rotor mechanism (as used in automatic mechanical watches) to generate electricity with a piezoelectric quartz crystal as its timing element.

Timer

timerstiming devicesoftware timer
Most electronic quartz watches, on the other hand, include time-related features such as timers, chronographs and alarm functions.
Individual timers are implemented as a simple single-chip computer system, similar to a watch and usually using the same, mass-produced, technology.

Pin-pallet escapement

pin pallet escapementBrocot escapementpin lever escapement
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.
A Roskopf, pin-lever, or pin-pallet escapement is an inexpensive, less accurate version of the lever escapement, used in mechanical alarm clocks, kitchen timers, mantel clocks and, until the 1970s, cheap watches now known as pin lever watches.

British Horological Institute

Horological JournalFBHI(FBHI)
By the end of the war, almost all enlisted men wore a wristwatch and after they were demobilized, the fashion soon caught on: the British Horological Journal wrote in 1917 that "the wristlet watch was little used by the sterner sex before the war, but now is seen on the wrist of nearly every man in uniform and of many men in civilian attire."
It also maintains a list of members whom it considers sufficiently qualified to repair clocks and watches, and who adhere to a strict code of practice.

Eco-Drive

Some models need only a few minutes of sunlight to provide weeks of energy (as in the Citizen Eco-Drive).
Eco-Drive is a model range of watches manufactured and marketed worldwide by Citizen Watch Co., Ltd., powered primarily by light.

Hamilton Watch Company

HamiltonBurenHamilton 500
The first electrically powered watch, the Hamilton Electric 500, was released in 1957 by the Hamilton Watch Company of Lancaster, Pennsylvania. The first digital electronic watch, a Pulsar LED prototype in 1970, was developed jointly by Hamilton Watch Company and Electro-Data, founded by George H. Thiess.
After its formation, the Hamilton Watch Company went on to manufacture and market pocket watches and wristwatches, ending American manufacture in 1969.

Solar-powered watch

lightlight-powered (solar)solar battery
Rechargeable batteries are used in some solar-powered watches.
A solar-powered watch or light-powered watch is a watch that is powered entirely or partly by a solar cell.

Resonance

resonantresonant frequencyresonance frequency
It resonates at a specific highly stable frequency, which is used to accurately pace a timekeeping mechanism.
Timekeeping mechanisms of modern clocks and watches, e.g., the balance wheel in a mechanical watch and the quartz crystal in a quartz watch

Patek Philippe SA

Patek PhilippePatek Philippe & CoPatek Philippe with a Sky Moon Tourbillion
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.
In 1868, Patek Philippe created the first Swiss wristwatch for Countess Koscowicz of Hungary.

Liquid-crystal display

LCDliquid crystal displayliquid crystal displays
All of the hands are normally mechanical, physically rotating on the dial, although a few watches have been produced with "hands" that are simulated by a liquid-crystal display.
Small LCD screens are common in portable consumer devices such as digital cameras, watches, calculators, and mobile telephones, including smartphones.

Waltham Watch Company

WalthamBoston Watch CompanyWaltham Watch Factory
Aaron Lufkin Dennison started a factory in 1851 in Massachusetts that used interchangeable parts, and by 1861 it was running a successful enterprise incorporated as the Waltham Watch Company.
Waltham International SA manufactures and distributes Waltham Swiss Made watches in the luxury watch market.

Dial (measurement)

dialdialsstationary dial face
A photovoltaic cell on the face (dial) of the watch converts light to electricity, which is used to charge a rechargeable battery or capacitor.
A dial is generally a flat surface, circular or rectangular, with numbers or similar markings on it, used for displaying the setting or output of a timepiece, radio, clock, watch, or measuring instrument.

WWVB

laterLF Radio WWVB Ft. Collins, CO 60 kHz
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.
In 2011, NIST estimated the number of radio clocks and wristwatches equipped with a WWVB receiver at over 50 million.

Pulsar (watch)

Pulsar
The first digital electronic watch, a Pulsar LED prototype in 1970, was developed jointly by Hamilton Watch Company and Electro-Data, founded by George H. Thiess.
Pulsar is a brand of watch and currently a division of Seiko Watch Corporation of America (SCA).

DCF77

LF Radio DCF77 Mainflingen, DE 77.5 kHz
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.
Radio clocks and watches have been very popular in Europe since the late 1980s and, in mainland Europe, most of them use the DCF77 signal to set their time automatically.

Casio

Casio Computer Co., LtdCasio ComputerCASIO Computer Co.
In Switzerland, Ebauches Electronic SA presented a prototype eight-digit LCD wristwatch showing time and date at the MUBA Fair, Basle, in March 1973, using a Twisted Nematic LCD manufactured by Brown, Boveri & Cie, Switzerland, which became the supplier of LCDs to Casio for the CASIOTRON watch in 1974.
Its products include calculators, mobile phones, digital cameras, electronic musical instruments, and digital watches.

Black Watch (wristwatch)

Black WatchThe Black Watch
An early LED watch that was rather problematic was The Black Watch made and sold by British company Sinclair Radionics in 1975.
The Black Watch is an electronic wristwatch launched in September 1975 by Sinclair Radionics.

Pierre Le Roy

PierreLe Roy
A major cause of error in balance wheel timepieces, caused by changes in elasticity of the balance spring from temperature changes, was solved by the bimetallic temperature compensated balance wheel invented in 1765 by Pierre Le Roy and improved by Thomas Earnshaw.
His technique for temperature compensation was highly efficient in that it worked without changing the length of the spiral balance spring, which he had discovered to be isochronous only at a precise given length (i.e. when frequency is independent of amplitude, so that a mechanical clock or watch runs at the same rate regardless of changes in its drive force, so it keeps correct time as the mainspring unwinds).

Calculator watch

calculationscalculatorswatches
As miniaturized electronics became cheaper, watches have been developed containing calculators, tonometers, barometers, altimeters, a compass using both hands to show the N/S direction, video games, digital cameras, keydrives, GPS receivers and cellular phones.
A calculator watch is a digital watch with a built in calculator, usually including buttons on the watch face.

Wearable computer

wearable computingwearableswearable
Several companies have however attempted to develop a computer contained in a wristwatch (see also wearable computer).
The definition of 'wearable computer' may be narrow or broad, extending to smartphones or even ordinary wristwatches.

Sinclair Radionics

Sinclair
An early LED watch that was rather problematic was The Black Watch made and sold by British company Sinclair Radionics in 1975.
In August 1975, Sinclair introduced the Black Watch digital watch at £17.95 in kit form and £24.95 ready-built, although this wasn't available to buy until January 1976.

Balance spring

hairspringisochronousbalance spring or "hair spring
A major cause of error in balance wheel timepieces, caused by changes in elasticity of the balance spring from temperature changes, was solved by the bimetallic temperature compensated balance wheel invented in 1765 by Pierre Le Roy and improved by Thomas Earnshaw. A great leap forward in accuracy occurred in 1657 with the addition of the balance spring to the balance wheel, an invention disputed both at the time and ever since between Robert Hooke and Christiaan Huygens.
Watch

Counterfeit watch

Counterfeit watchescounterfeitedcounterfeits
Trade in counterfeit watches, which mimic expensive brand-name watches, constitutes an estimated market per year.
A counterfeit watch is an illegal copy of an authentic watch.

Time signal

radio time signaltime servicetime gun
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.
Radio time signal stations broadcast the time in both audible and machine-readable time code form that can be used as references for radio clocks and radio-controlled watches.

Sapphire

star sapphiresapphire crystalsapphires
Some are made entirely of faceted sapphire (corundum).
Because of the remarkable hardness of sapphires – 9 on the Mohs scale (the third hardest mineral, after diamond at 10 and moissanite at 9.5) – sapphires are also used in some non-ornamental applications, such as infrared optical components, high-durability windows, wristwatch crystals and movement bearings, and very thin electronic wafers, which are used as the insulating substrates of very special-purpose solid-state electronics (especially integrated circuits and GaN-based LEDs).