Joepete Skrev:Ok, tak John. Jeg kan huske at have set nogle King Seiko ure fra slut 60´erne med "Chronometer" påtrykt skiven. Når vi kommer frem til ca. ´70, så forekommer der ingen af disse skiver - selv om værkerne er de samme. Kan du huske hvornår det blev en "schweizisk fest" ?
Det tror jeg altid det har været
Betegnelsen Chronometer er ikke forbeholdt ure som er COSC. Det er en gammen betegnelse for ure som er testet, oftest i flere prositioner, for nøjagtighed, så vidt jeg ved. Der var allerede 1730 betegnelser som Marine kronometer.
Der er flere institutter som kan teste til betegnelsen chronometer, bla.a. Kew Observatory som jo ligger ved London.
Fordelen ved COSC er at det er en fælles standard, så man umiddelbart ved hvad det indebærer.
Wikipedia siger:
A chronometer watch is a watch tested and certified to meet certain precision standards. In Switzerland, only timepieces certified by the COSC may use the word 'Chronometer' on them.
However, numerous prominent Swiss watch manufacturers do not submit their movements for COSC certification, although such movements would probably easily qualify as chronometers under the COSC certification rules, e.g. nowadays, some of the ″Haute Horlogerie″ Swiss Watch Manufacturers have created on 5 June 2001, ″The Fleurier Quality Foundation″ to establish new aesthetic and technical criteria dedicated to the certification of finished watches. Their certification meets a normative requirement for the market and the final customer to have a better definition of quality watchmaking, adapted to today's demands and technological advances.
The term chronometer is also used to describe a marine chronometer used for celestial navigation. The marine chronometer was invented by John Harrison in 1730. This was the first of a series of chronometers which enabled accurate marine navigation. For the next 250 years, an accurate chronometer was essential to any kind of marine or air navigation until the implementation of global satellite navigation at the end of the 20th century. The marine chronometer is no longer used for navigation.
Once mechanical timepiece movements developed sufficient precision to allow for accurate marine navigation, there eventually developed what became known as "chronometer competitions" at astronomical observatories located in Europe. The Neuchatel Observatory, Geneva Observatory, Besancon Observatory, and Kew Observatory are prominent examples of observatories that certified the accuracy of mechanical timepieces.
The observatory testing regime typically lasted for 30 to 50 days and contained accuracy standards that were far more stringent and difficult than modern standards such as those set by COSC. When a movement passed the Observatory, it became certified as an Observatory Chronometer and received a Bulletin de Marche from the Observatory, stipulating the performance of the movement. Because only very few movements were ever given the attention and manufacturing level necessary to pass the Observatory standards, there are very few Observatory Chronometers in existence. Most Observatory Chronometers had movements so specialized to accuracy that they could never withstand being used as wristwatches in normal usage. They were useful only for accuracy competitions, and so never were sold to the public for usage. However,in 1966 and 1967, Girard Perregaux manufactured approximately 670 wristwatches with the Calibre 32A movement, which became Observatory Chronometers certified by the Neuchatel Observatory. These Observatory Chronometers were then sold to the public for normal usage as wristwatches, and some examples of this watch may still be found today. The Observatory competitions ended with the advent of the quartz watch movement, in the late 1960's and early 1970's.
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