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[[Image:The Magma - 21st Century Watch Design.jpg|thumb|The Magma watch]] |
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A '''watch''' is a timepiece that is made to be worn on a person. The term now usually refers to a ''wristwatch'', which is worn on the wrist with a strap or [[bracelet]]. In addition to the [[time]], modern watches often display the [[day]], [[calendar date|date]], [[month]] and [[year]], and electronic watches may have many other functions. |
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Most inexpensive and medium-priced watches used mainly for timekeeping are electronic watches with [[quartz clock#Mechanism|quartz movements]]. Expensive, [[collectible]] watches valued more for their workmanship and aesthetic appeal than for simple timekeeping, often have purely mechanical movements and are powered by springs, even though mechanical movements are less accurate than more affordable quartz movements. |
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Before the inexpensive [[miniaturization]] that became possible in the 20th century, most watches were ''[[pocket watch]]es,'' which had covers and were carried in a pocket and attached to a watch chain or [[watch fob]]. Watches evolved in the 1600s from spring powered clocks, which appeared in the 1400s. |
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== Parts == |
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===Movement=== |
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A [[movement (clockwork)|movement]] in watchmaking is the mechanism that measures the passage of time and displays the current time (and possibly other information including date, month and day). Movements may be entirely mechanical, entirely electronic (potentially with no moving parts), or a blend of the two. Most watches intended mainly for timekeeping today have electronic movements, with mechanical hands on the face of the watch indicating the time. |
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==== Mechanical movements ==== |
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:''Main article [[Mechanical watch]].'' |
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:''See also [[Self-winding watch]].'' |
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[[Image:000 0rysdf251 edited.jpg|left|thumb|200px|A Russian-made mechanical watch movement.]] |
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Compared to electronic movements, mechanical watches are less accurate, often with errors of seconds per day, and they are sensitive to position and temperature. As well, they are costly to produce, they require regular maintenance and adjustment, and they are more prone to failure. Nevertheless, the "old world" craftsmanship of mechanical watches still attracts interest from part of the watch-buying public. |
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Mechanical movements use an [[escapement]] mechanism to control and limit the unwinding of the watch, converting what would otherwise be a simple unwinding, into a controlled and [[Periodicity|periodic]] energy release. Mechanical movements also use a [[balance wheel]] together with the [[balance spring]] (also known as Hairspring) to control motion of the gear system of the watch in a manner analogous to the [[pendulum]] of a [[pendulum clock]]. The [[tourbillon]], an optional part for mechanical movements, is a rotating frame for the escapement which is intended to cancel out or reduce the effects of bias to the timekeeping of [[gravity|gravitational]] origin. Due to the complexity designing a tourbillon, they are very expensive, and only found in "prestige" watches. The [[Pin-lever escapement|pin-lever]] (also called Roskopf movement after its inventor, [[Georges Frederic Roskopf]]), is a cheaper version of the fully levered movement which was manufactured in huge quantities by many Swiss manufacturers as well as [[Timex]], until it was replaced by quartz movements.<ref>[http://www.musketeer.ch/Bilder/uhr_bild/RoskAnker.jpg The original pin-pallet]</ref><ref>[http://www.musketeer.ch/watches/roskopf.html The Roskopf Watch] |
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</ref> |
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Tuning fork watches use a type of electromechanical movements. Introduced by [[Bulova]] in 1960, they use a tuning fork at a precise frequency (most often 360 [[hertz]]) to drive a mechanical watch. The task of converting electronically pulsed fork vibration into rotary movement is done via two tiny jeweled fingers, called pawls. Tuning fork watches were rendered obsolete when electronic quartz watches were developed, because quartz watches were cheaper to produce and even more accurate. |
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==== Electronic movements ==== |
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:''See also [[electric watch]].'' |
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Electronic movements have few or no moving parts, as they use the [[piezoelectric effect]] in a tiny [[quartz]] crystal to provide a stable time base for a mostly electronic movement. The crystal forms a [[quartz oscillator]] which [[resonance|resonates]] at a specific and highly stable frequency, and which can be used to accurately pace a timekeeping mechanism. For this reason, electronic watches are often called ''quartz watches.'' Most quartz movements are primarily electronic but are geared to drive mechanical hands on the face of the watch in order to provide a traditional analog display of the time, which is still preferred by most consumers. |
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The first prototypes of electronic [[Quartz clock|quartz watches]] were made by the CEH research laboratory in [[Switzerland]] in 1962. The first quartz watch to enter production was the [[Seiko]] [[Astron (wristwatch)|35 SQ Astron]], which appeared in 1969. Modern quartz movements are produced in very large quantities, and even the cheapest wristwatches typically have quartz movements. Whereas mechanical movements can typically be off by several seconds a day, an inexpensive quartz movement in a child's wristwatch may still be accurate to within 500 milliseconds per day—ten times better than a mechanical movement.<ref>Quartz mechanisms usually have a resonant frequency of 32768 Hz, chosen for ease of use (being 2<sup>15</sup>). Using a simple 15 stage divide-by-two circuit, this is turned into a 1 pulse per second signal responsible for the watch's keeping of time.</ref>Some watchmakers combine the quartz and mechanical movements, such as the [[Seiko]] [[Spring Drive]], introduced in 2005. |
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Radio time signal watches are a type of electronic quartz watches which synchronizes ([[time transfer]]) its time with an external [[Time signal#Radio time signals|time source]] such as an [[atomic clock]]s, time signals from [[GPS]] navigation satellites, the German [[DCF77]] signal in Europe, [[WWVB]] in the US, and others. Movements of this type synchronize not only the time of day but also the date, the [[leap year|leap-year]] status of the current year, and the current state of [[daylight saving time]] (on or off). |
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===Power sources=== |
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{{main|Mainspring}} |
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Traditional mechanical watch movements use a spiral spring called a [[mainspring]] as a power source. In ''manual watches'' the spring must be rewound by the user periodically by turning the watch crown. Antique [[pocketwatch]]es were wound by inserting a separate key into a hole in the back of the watch and turning it. Most modern watches are designed to run 40 hours on a winding, so must be wound daily, but some run for several days and a few have 192-hour mainsprings and are wound weekly. |
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{{main|Automatic watch}} |
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[[Image:Jaeger-Lecoultre-p1000838.jpg|thumb|Automatic watch: An eccentric weight called a rotor, swings with the movement of the wearer's body and winds the spring]] |
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A ''self-winding'' or ''automatic'' mechanism is one that rewinds the mainspring of a mechanical movement by the natural motions of the wearer's body. The first self-winding mechanism, for pocketwatches, was invented in 1770 by |
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[[Abraham-Louis Breguet]];<ref>{{cite web | url=http://www.worldtempus.com/wt/1/6791/ | title=Watchmaking in Europe and China: Watches & Wonders | work=[[Richemont]] | publisher=Worldtempus | accessdate=2007-01-17}}</ref> but the first "[[self-winding watch|self-winding]]," or "automatic," wristwatch was the invention of a British watch repairer named [[John Harwood]] in 1923. This type of watch allows for a constant winding without special action from the wearer: it works by an eccentric weight, called a winding rotor, which rotates with the movement of the wearer's wrist. The back-and-forth motion of the winding rotor couples to a [[ratchet (device)|ratchet]] to automatically wind the mainspring. Self winding watches usually can also be wound manually so they can be kept running when not worn, or if the wearer's wrist motions don't keep the watch wound. |
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Some electronic watches are also powered by the movement of the wearer of the watch. [[Automatic quartz|Kinetic powered quartz watches]] make use of the motion of the wearer's arm turning a rotating weight, which turns a [[Electrical generator|generator]] to supply power to charge a rechargeable battery that runs the watch. The concept is similar to that of self-winding spring movements, except that electrical power is generated instead of mechanical spring tension. |
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Electronic watches require electricity as a power source. Some mechanical movements and hybrid electronic-mechanical movements also require electricity. Usually the electricity is provided by a replaceable [[battery (electricity)|battery]]. The first use of electrical power in watches was as substitute for the mainspring, in order to remove the need for winding. The first electrically-powered watch, the Hamilton Electric 500, was released in 1957 by the [[Hamilton Watch Company]] of [[Lancaster, Pennsylvania]]. |
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[[Watch battery|Watch batteries]] (strictly speaking cells) are specially designed for their purpose. They are very small and provide tiny amounts of power continuously for very long periods (several years or more). In most cases, replacing the battery requires a trip to a watch-repair shop or watch dealer; this is especially true for watches that are designed to be water-resistant, as special tools and procedures are required to ensure that the watch remains water-resistant after battery replacement. Silver-oxide and lithium batteries are popular today; mercury batteries, formerly quite common, are no longer used, for environmental reasons. Cheap batteries may be alkaline, of the same size as silver-oxide but providing shorter life. Rechargeable batteries are used in some solar powered watches. |
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[[Solar powered watch]]es are powered by light. A [[photovoltaic cell]] on the face ([[dial]]) of the watch converts light to electricity, which in turn is used to charge a rechargeable battery or [[capacitor]]. The movement of the watch draws its power from the [[rechargeable battery]] or capacitor. As long as the watch is regularly exposed to fairly strong light (such as sunlight), it never needs battery replacement, and some models need only a few minutes of sunlight to provide weeks of energy (as in the Citizen [[Eco-Drive]]). |
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Some of the early solar watches of the 1970s had innovative and unique designs to accommodate the array of solar cells needed to power them ([http://www.ledwatches.net/articles/synchronar_review.html Synchronar], Nepro, Sicura and some models by Cristalonic, Alba, Seiko and Citizen). As the decades progressed and the efficiency of the solar cells increased while the power requirements of the movement and display decreased, solar watches began to be designed to look like other conventional watches.<ref>{{cite web | url=http://www.soluhr.com/ | title=History of the Solar Wristwatch | work=Soluhr.com | accessdate=2007-01-17}}</ref> A rarely used power source is the temperature difference between the wearer's arm and the surrounding environment (as applied in the [[Citizen Watch Co., Ltd|Citizen]] [[Eco-Drive]] Thermo). |
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===Display=== |
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====Analog==== |
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Traditionally, watches have displayed the time in analog form, with a numbered dial upon which are mounted at least a rotating hour hand and a longer, rotating minute hand. Many watches also incorporate a third hand that shows the current second of the current minute. Watches powered by quartz have second hands that snap every second to the next marker. Watches powered by a mechanical movement have a "sweep second hand", the name deriving from its uninterrupted smooth (sweeping) movement across the markers, although this is actually a misnomer; the hand merely moves in smaller steps, typically 1/6 of a second, corresponding to the beat of the balance wheel. 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|liquid-crystal display]]. |
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Analog display of the time is nearly universal in watches sold as jewelry or collectibles, and in these watches, the range of different styles of hands, numbers, and other aspects of the analog dial is very broad. In watches sold for timekeeping, analog display remains very popular, as many people find it easier to read than digital display; but in timekeeping watches the emphasis is on clarity and accurate reading of the time under all conditions (clearly marked digits, easily visible hands, large watch faces, etc.). They are specifically designed for the left wrist with the stem (the knob used for changing the time) on the right side of the watch; this makes it easy to change the time without removing the watch from the hand. This is the case if one is right-handed and the watch is worn on the left wrist (as is traditionally done). If one is left-handed and wears the watch on the right wrist, one has to remove the watch from the wrist to reset the time or to wind the watch. |
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Analog watches as well as clocks are often marketed showing a display time of approximately 10:09. This creates a visually pleasing smile-like face on upper half of the watch. Digital displays often show a time of 12:38, where the increases in the numbers from left to right culminating in the fully-lit numerical display of the 8 also gives a positive feeling.<ref>The Ten Ten Tenet http://www.snopes.com/business/market/clockhands.asp/</ref> |
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====Digital==== |
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[[Image:Datalink USB Dress Edition.JPG|240px|thumb|Timex Datalink USB Dress edition from 2003 with a dot matrix display; the ''Invasion'' video game is on the screen.]] |
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Since the advent of electronic watches that incorporate small computers, digital displays have also been available. A digital display simply shows the time as a number, ''e.g.,'' '''12:40 AM''' instead of a short hand pointing towards the number 12 and a long hand pointing towards the number 8 on a dial. Some watches, such as the [[Timex Datalink#Timex Datalink USB|Timex Datalink USB]], feature [[dot matrix]] displays. |
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The first digital watch, a [[Pulsar (watch)|Pulsar]] prototype in 1970, was developed jointly by [[Hamilton Watch Company]] and Electro-Data. John Bergey, the head of Hamilton's Pulsar division, said that he was inspired to make a digital timepiece by the then-futuristic digital clock that Hamilton themselves made for the 1968 science fiction film ''[[2001: A Space Odyssey (film)|2001: A Space Odyssey]]''. On [[April 4]], [[1972]] the Pulsar was finally ready, made in 18-carat gold and sold for $2,100 at retail. It had a red [[light-emitting diode]] (LED) display. Another early digital watch innovator, Roger Riehl's Synchronar Mark 1, provided an LED display and used solar cells to power the internal nicad batteries.<ref>{{cite web | first=Guy | last=Ball | url=http://www.ledwatches.net/articles/Synchronar%202100%20Solar%20LED%20Watch.htm | title=Synchronar 2100 Solar LED Watch | work=LED Watches | accessdate=2007-01-17}}</ref> |
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Most watches with LED displays required that the user press a button to see the time displayed for a few seconds, because LEDs used so much power that they could not be kept operating continuously. Watches with LED displays were popular for a few years, but soon the LED displays were superseded by [[liquid crystal display]]s (LCDs), which used less battery power and were much more convenient in use, with the display always visible and no need to push a button before seeing the time. The first LCD watch with a six-digit LCD was the 1973 [[Seiko]] 06LC, although various forms of early LCD watches with a four-digit display were marketed as early as 1972 including the 1972 [http://www.ledwatches.net/photo-pages/gruen-teletime-lcd.htm Gruen Teletime LCD Watch], and the Cox Electronic Systems Quarza.<ref>{{cite web | first=Guy | last=Ball | url=http://www.ledwatches.net/photo-pages/gruen-teletime-lcd.htm | title=Gruen Teletime LCD Watch | work=LED Watches | year=2003 | accessdate=2007-01-17}}</ref><ref>{{cite web | url=http://pocketcalculatorshow.com/magicalgadget/index3.html#teletime | title=Casio TA-1000 Electronic Clock & Calculator | work=Magical Gadgets, Sightings & Brags | publisher=Pocket Calculator Show | accessdate=2007-01-17}}</ref> |
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Digital watches were very expensive and out of reach to the common consumer until 1975, when [[Texas Instruments]] started to mass produce LED watches inside a plastic case. These watches, which first retailed for only $20, reduced to $10 in 1976, saw Pulsar lose $6 million and the brand sold to competitors twice in only a year, eventually becoming a subsidiary of Seiko and going back to making only analogue quartz watches. |
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From the 1980s onward, digital watch technology vastly improved. In 1982 Seiko produced a watch with a small television screen built in, and Casio produced a digital watch with a thermometer as well as another that could translate 1,500 Japanese words into English. In 1985, Casio produced the CFX-400 scientific calculator watch. In 1987 Casio produced a watch that could dial your telephone number and Citizen revealed one that would react to your voice. In 1995 Timex release a watch which allowed the wearer to download and store data from a computer to their wrist. Since their apex during the late 1980s to mid 1990s high technology fad, digital watches have ''mostly'' devolved into a simpler, less expensive basic time piece with little variety between models. |
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Despite these many advances, almost all watches with digital displays are used as timekeeping watches. Expensive watches for collectors rarely have digital displays since there is little demand for them. Less craftsmanship is required to make a digital watch face and most collectors find that analog dials (especially with [[Complication (horology)|complications]]) vary in quality more than digital dials due to the details and finishing of the parts that make up the dial (thus making the differences between a cheap and expensive watch more evident). |
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==Functions== |
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All watches provide the time of day, giving at least the hour and minute, and usually the second. Most also provide the current date, and often the day of the week as well. However, many watches also provide a great deal of information beyond the basics of time and date. Some watches include [[alarm]]s. Other elaborate and more expensive watches, both pocket and wrist models, also incorporate [[Striking clock|striking mechanisms]] or [[Repeater (horology)|repeater]] functions, so that the wearer could learn the time by the sound emanating from the watch. This announcement or striking feature is an essential characteristic of true clocks and distinguishes such watches from ordinary [[Clock|timepieces]]. This feature is available on most digital watches. |
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A ''complicated watch'' has one or more functions beyond the basic function of displaying the time and the date; such a functionality is called a [[Complication (horology)|complication]]. Two popular complications are the '''[[chronograph]]''' complication, which is the ability of the watch movement to function as a [[stopwatch]], and the '''moonphase''' complication, which is a display of the [[lunar phase]]. Other more expensive complications include, [[Tourbillion]], [[Perpetual calendar]], [[Minute repeater]] and [[Equation of time]]. A truly complicated watch has many of these complications at once (see [[Calibre 89]] from [[Patek Philippe]] for instance). Among watch enthusiasts, complicated watches are especially collectible. Some watches include a second 12-hour display for [[UTC]] (as [[Pontos Grand Guichet GMT]]). |
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[[Image:Rolex-Submariner.jpg|thumb|right|The Rolex Submariner is an officially certified chronometer]] |
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The similar-sounding terms '''chronograph''' and '''chronometer''' are often confused, although they mean altogether different things. A chronograph is a type of complication, as explained above. A [[chronometer watch]] is an all-mechanical watch or clock whose movement has been tested and certified to operate within a certain standard of accuracy by the [[COSC]] (Contrôle Officiel Suisse des Chronomètres). The concepts are different but not mutually exclusive; a watch can be a chronograph, a chronometer, both, or neither. |
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==Types == |
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===Fashion=== |
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Wristwatches are often treated as jewelry or as collectible works of art rather than as timepieces. This has created several different markets for wristwatches, ranging from very inexpensive but accurate watches intended for no other purpose than telling the correct time, to extremely expensive watches that serve mainly as personal adornment or as examples of high achievement in miniaturization and precision mechanical engineering. Still another market is that of “geek watches”—watches that not only tell the time, but incorporate computers, satellite navigation, complications of various orders, and many other features that may be quite removed from the basic concept of timekeeping. A dual time watch is designed for travelers, allowing them to see what time it is at home when they are elsewhere. |
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Most companies that produce watches specialize in one of these markets. Companies such as [[Breitling]], [[Patek Phillipe]], [[Jaeger-LeCoultre]], [[Omega SA|Omega]], [[Blancpain]], Longines, [[Ebel]], and [[Rolex]] specialize in watches as jewelry or fine mechanical devices, while companies such as [[Casio]] and [[Timex]] specialize in watches as timepieces or multifunctional computers. In the 1980s, the Swiss [[Swatch]] company hired graphic designers to redesign a new annual collection of non-repairable watches. |
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===Computerized multi-function watches=== |
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Many computerized wristwatches have been developed, but none have had long-term sales success, because they have awkward [[user interface]]s due to the tiny screens and buttons, and a short battery life. As miniaturized electronics became cheaper, watches have been developed containing [[calculator]]s, [[tonometer]]s, [[barometer]]s, [[altimeter]]s, [[video game]]s, [[digital camera]]s, [[keydrive]]s, [[GPS]] receivers and [[cellular phone]]s. In the early 1980s [[Seiko]] marketed a watch with a [[television]] in it. Such watches have also had the reputation as unsightly and thus mainly [[geek]] toys. Several companies have however attempted to develop a [[computer]] contained in a wristwatch (see also [[wearable computer]]). |
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===For space travel=== |
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[[Image:OMEGA-Speedmaster-Professional-Front.jpg|thumb|right|The [[Omega SA|Omega]] [[Moonwatch|Speedmaster]], selected by U.S. space agencies.]] |
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[[Weightlessness|Zero gravity]] environment and other extreme conditions encountered by [[astronaut]]s in space requires the use of specially tested watches. On [[April 12]], [[1961]], [[Yuri Gagarin]] wore a Shturmanskie (a transliteration of Штурманские which actually means "navigators") wristwatch during his historic first flight into space. The Shturmanskie was manufactured at the [[Poljot|First Moscow Factory]]. |
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Since 1964, the watches of the [[Poljot|First Moscow Factory]] have been marked by a trademark "ПОЛЕТ" and "POLJOT", which means "flight" in Russian and is a tribute to the number of many space trips its watches have accomplished. In the late 1970s, [[Poljot]] launched a new chrono movement, the 3133. With a 23 jewel movement and manual winding (43 hours), it was a modified Russian version of the Swiss [[Valjoux]] 7734 of the early 1970s. [[Poljot]] 3133 were taken into space by astronauts from Russia, France, Germany and Ukraine. On the arm of [[Valeriy Polyakov]], a [[Poljot]] 3133 chronograph movement-based watch set a space record for the longest space flight in history. |
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<ref>[http://www.netgrafik.ch/russian_space_watches.htm Russian Space Watches History]</ref> |
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During the 1960s, a large range of watches were tested for durability and precision under extreme temperature changes and vibrations. The [[Omega SA|Omega]] [[Omega Speedmaster Professional|Speedmaster Professional]] was selected by U.S. space agencies. (For a list of [[NASA]]-certified watches, see this footnote).<ref>FLIGHT-CERTIFIED BY [[NASA]] FOR ALL MANNED SPACE MISSIONS: |
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* [[Omega SA|Omega]] [[Omega Speedmaster Professional|Speedmaster Professional 3570.50.00]] |
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FLIGHT-QUALIFIED BY [[NASA]] FOR SPACE MISSIONS: |
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* [[Omega SA|Omega]] Speedmaster Professional X-33 |
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* [[Casio]] [[G-Shock]] [[DW-5600C]] |
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* [[Casio]] [[G-Shock]] [[DW-5600E]] |
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* [[Casio]] [[G-Shock]] DW-5900 |
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* [[Casio]] [[G-Shock]] DW-6900 |
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* [[Casio]] [[G-Shock]] [[Master of G]] G-9000 |
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* [[Timex Corporation|Timex]] [[Timex Datalink#Ironman Datalink|IRONMAN Triathlon Data Link]]</reF> |
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[[TAG Heuer]] became the first Swiss watch in space thanks to an Heuer Stopwatch, worn by [[John Glenn]] in 1962 when he piloted the [[Friendship 7]] on the first manned U.S. orbital mission. (The company was called "Heuer". TAG had not even been formed in 1962.) |
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The [[Breitling]] Navitimer Cosmonaute was designed with a [[24-hour analog dial]] to avoid confusion between AM and PM, which are meaningless in space. It was first worn in space by U.S. astronaut [[Scott Carpenter]] on [[May 24]], [[1962]] in the [[Aurora 7]] mercury capsule.<ref>{{cite web | url=http://www.breitling.com/en/models/navitimer/cosmonaute/ | title=Navitimer, the aviator favourite watch | work=[[Breitling]] | accessdate=2007-01-17}}</ref> |
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Since 1994 [[Fortis Uhren AG|Fortis]] is the exclusive supplier for manned space missions authorized by the [[Russian Federal Space Agency]]. |
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[[China National Space Administration|China National Space Administration (CNSA)]] astronauts wear the [[Fiyta]]<ref>{{cite web | url=http://www.fiyta.com.cn | title=Fiyta.com.cn | work=Fiyta | accessdate=2007-01-17}}</ref> spacewatches. |
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At [[BaselWorld]], 2008, [[Seiko]] announced the creation of the first watch ever designed specifically for a space walk, [http://www.seikospringdrive.com/spacewalk Spring Drive Spacewalk]. |
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=== For scuba diving === |
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[[Image:Seiko 7002-7020 Diver's 200 m on a 4-ring NATO style strap.JPG|thumb|right|Seiko 7002-7020 Diver's 200 m on a 4-ring NATO style strap.]] |
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Watches may be crafted to become water resistant. These watches are sometimes called [[diving watches]] when they are suitable for [[scuba diving]] or [[saturation diving]]. The [[International Organization for Standardization]] issued a standard for water resistant watches which also prohibits the term "[[waterproof]]" to be used with watches, which many countries have adopted. Water resistance is achieved by the [[gasket]]s which form a watertight seal, used in conjunction with a sealant applied on the case to help keep water out. The material of the case must also be tested in order to pass as water resistant.<ref>{{cite web | url=http://www.europastar.com/europastar/watch_tech/waterresistance.jsp Europa Star Online article | title=Watch Industry Questions and Answers: Water-Resistance | work=Europa Star | publisher=VNU eMedia Inc | accessdate=2007-01-17}}</ref> |
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The watches are tested in theoretical depths, thus a watch with a 50 meter rating will be water resistant if it is stationary and under 50 meters of still water for a set amount of time. The most commonly used method for testing the water resistance is by depressurizing a small chamber containing the watch. A sensor measures the movement of the case and crystal to gauge how much pressure the watch is losing and how fast. The watch never touches water in this type of machine. Another type of machine is used for very deep measure tests, where the watch is immersed in a small container filled with water, this chamber is then submitted to the pressure the watch is supposed to withstand. In neither case is there any variation in the pressure, or is the watch submitted to that pressure for an extended period of time(normally only a couple of minutes). These are the only logical ways to test the water resistance of a watch, since if adding variations added by time spent underwater or the movement of the wearers hands would simply make this a very intricate and difficult measurement. Although confusing this is the best way of telling the customer what to expect. For normal use, the ratings must therefore be translated from the pressure the watch can withstand to take into account the extra pressure generated by motion and time spent underwater. |
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Watches are classified by their degree of water resistance, which roughly translates to the following (1 meter = 3.2808398950131 feet):<ref>[http://www.jwnz.co.nz/brochures/watches.asp This water resistance classification guide has been developed by the Jewellers and Watchmakers of New Zealand (Inc.) in conjunction with the major watch importers and wholesalers in New Zealand.]</ref> |
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{| class="wikitable" |
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| '''Water resistance rating''' || '''Suitability''' || '''Remarks''' |
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|- |
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| Water Resistant 30 m or 50 m || Suitable for water related work and fishing. || NOT suitable for swimming or diving. |
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|- |
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| Water Resistant 100 m || Suitable for recreational surfing, swimming, snorkeling, sailing and water sports. || NOT suitable for diving. |
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|- |
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| Water Resistant 200 m || Suitable for professional marine activity and serious surface water sports. || NOT suitable for diving. |
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|- |
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| Diver's 100 m || Minimum ISO standard ([[ISO 6425]]) for [[scuba diving]] at depths NOT requiring helium gas. || Diver's 100 m and 150 m watches are generally old(er) watches. |
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|- |
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| Diver's 200 m or 300 m || Suitable for scuba diving at depths NOT requiring helium gas. || Typical ratings for contemporary diver's watches. |
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|- |
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| Diver's 300<sup>+</sup> m helium safe|| Suitable for [[saturation diving]] (helium enriched environment). || Watches designed for helium mixed-gas diving will have additional markings to point this out. |
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|} |
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Some watches use [[Bar (unit)|bar]] instead of meters, which may then be multiplied by 10 to be approximately equal to the rating based on meters. Therefore, a 10 bar watch is equivalent to a 100 meter watch. Some watches are rated in [[Atmosphere (unit)|atmospheres]] (atm), which are roughly equivalent to bar. |
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==History== |
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{{see|History of watches}} |
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<!-- Deleted image removed: [[Image:Relogio stDumont.jpg|125px|thumb|"Santos", an [[History of timekeeping devices#Wristwatches|early wristwatch for men from about 1911]].]] --> |
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In the 15th century, the increase in European seagoing [[navigation]] and [[mapping]] increased the demand for a portable timepiece, because the only way a ship could measure its [[longitude]] was by comparing the midday (high noon) time of the local longitude to that of a European [[meridian (geography)|meridian]] (usually [[Paris]] or [[Greenwich]]) using the time kept on a shipboard clock. However, the process was notoriously unreliable until the introduction of [[John Harrison]]'s [[marine chronometer]]. For that reason, most maps from the 15th century through the 19th century have precise latitudes but distorted longitudes. |
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The first reasonably accurate mechanical clocks measured time with simple weighted [[pendulum]]s, which are unworkable when irregular movement of the [[fulcrum]] occur whether at sea or in watches. The invention of a [[Spring (device)|spring]] mechanism was crucial for portable clocks. In [[Tudor period|Tudor]] [[England]], the development of "pocket-clockes" was enabled by the development of reliable springs and [[escapement]] mechanisms, which allowed clockmakers to compress a timekeeping device into a small, portable compartment. |
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In 1524, [[Peter Henlein]] created the first [[pocket watch]].<ref>{{cite web | url=http://www.paralumun.com/watchhistory.htm | title=History of Watches | work=Paralumun New Age Village | accessdate=2007-01-17}}</ref> Early watches only had an [[hour]] hand—a [[minute]] hand would have been useless because of the inaccuracy of the watch mechanism. Eventually, miniaturization of these spring-based designs allowed for accurate portable timepieces ([[marine chronometer]]s) which worked well even at sea. In 1556, [[Taqi al-Din]] created a spring-powered<ref name=Hassani>{{cite web|author=[[Salim Al-Hassani]]|title=The Astronomical Clock of Taqi Al-Din: Virtual Reconstruction|publisher=FSTC|url=http://muslimheritage.com/topics/default.cfm?ArticleID=947|date=19 June 2008|accessdate=2008-07-02}}</ref> pocket watch,<ref name=Hill>{{cite web|author=[[Donald Routledge Hill]] and [[Ahmad Y Hassan]]|title=Engineering in Arabic-Islamic Civilization|url=http://www.history-science-technology.com/Articles/articles%2011.htm|work=History of Science and Technology in Islam|accessdate=2008-07-03}}</ref> which was able to measure the time in minutes by having three [[Dial (measurement)|dials]] for the hours, degrees and minutes.<ref name=Hassani/> Another early example of a watch which measured time in minutes was created by another [[Ottoman Empire|Ottoman]] watchmaker, Meshur Sheyh Dede, in 1702.<ref>{{citation|title=Topkapi’s Turkish Timepieces|first=Paul|last=Horton|year=1977|journal=[[Saudi Aramco World]], July-August 1977|pages=10-13|url=http://www.saudiaramcoworld.com/issue/197704/topkapi.s.turkish.timepieces.htm|accessdate=2008-07-12}}</ref> |
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In 1850, [[Aaron Lufkin Dennison]] founded [[Waltham Watch Company]], which was the pioneer of the industrial manufacturing of pocket watches with interchangeable parts, the [[American System of Watch Manufacturing]]. Breguet developed the first self-winding watch known as the perpetual in 1780.<ref>Breguet History Book</ref> |
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==See also== |
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{{col-begin}} |
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{{col-2}} |
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*[[American Watchmakers-Clockmakers Institute]] |
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*[[Clock]] |
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*[[Mechanical watch]] |
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*[[Chronometer watch]] |
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*[[Marine chronometer]] |
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*[[Calculator watch]] |
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*[[Horology]] |
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*[[List of watch manufacturers]] |
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*[[National Association of Watch and Clock Collectors]] |
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{{col-2}} |
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*[[Clock|Timepiece]] |
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*[[Wearable computer]] |
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*[[Replica watch]] |
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*[[Compass direction using a watch]] |
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*[[BaselWorld]] |
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*[[Wrist watch (history)]] |
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*[[Georges Frederic Roskopf]] |
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*[[Jewel bearing]] |
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{{col-end}} |
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*[[Automatic Watch Winder]] |
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==References== |
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{{Reflist}} |
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==External links== |
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{{Wiktionarypar|watch}} |
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* [http://www.wristfashion.com/ Wrist Fashion] |
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* [http://www.horlogerie-suisse.ch/ Portal of Horology] |
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* [http://www.fhs.ch/ Federation of the Swiss Watch Industry FH] |
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* [http://www.hautehorlogerie.org/ FHH Fine Watchmaking Foundation] |
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* [http://www.awci.com/ AWCI American Watchmakers-Clockmakers Institute (United States)] |
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* [http://www.nawcc.org/ NAWCC The National Association of Watch and Clock Collectors (United States)] |
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*[http://chronocentric.com/ Chronocentric.com] |
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*[http://v3.espacenet.com/textdoc?DB=EPODOC&IDX=GB218487&F=0 UK patent GB218487, Improvements relating to wrist watches], 1923 patent resulting from John Harwood's invention of a practical self-winding watch mechanism. |
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*[http://bhi.co.uk/ The British Horological Institute Limited] |
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*[http://www.thewatchforum.co.uk/ Large knowledgebase of all things horological] |
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{{TimeSig}} |
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{{Time measurement and standards}} |
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{{timezones}} |
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[[Category:Clocks]] |
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[[Category:Horology]] |
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[[Category:Time]] |
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[[Category:Watches]] |
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[[Category:Fashion accessories]] |
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[[Category:Portable devices]] |
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[[it:Orologio da polso]] |
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