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A chronometer (Ancient Greek: χρονόμετρον, khronómetron, "time measurer") is a highly accurate mechanical timepiece, with an original focus on the needs of maritime navigation. In Switzerland, timepieces certified by the Contrôle Officiel Suisse des Chronomètres (COSC) may be marked as Certified Chronometer or Officially Certified Chronometer. Outside…
History & Standards
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chronometer navigation observatory chronometers mechanical certified marine watch timepieces cosc movement wristwatches used accuracy chronograph accurate may standards term switzerland
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| those set by COSC | instance of | 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 | 0.80 | text |
| diamond | instance of | Hard stones | 0.80 | text |
| ruby | instance of | Hard stones | 0.80 | text |
| and sapphire were often used as jewel bearings to decrease friction | instance of | Hard stones | 0.80 | text |
| wear of the pivots | instance of | Hard stones | 0.80 | text |
| escapement | instance of | Hard stones | 0.80 | text |
| gold | instance of | Chronometer makers also took advantage of the physical properties of rare metals | 0.80 | text |
| platinum | instance of | Chronometer makers also took advantage of the physical properties of rare metals | 0.80 | text |
| and palladium.ComplicationsIn horological terms | instance of | Chronometer makers also took advantage of the physical properties of rare metals | 0.80 | text |
| a complication in a mechanical watch is a special feature that causes the design of the watch movement to become more complicated | instance of | Chronometer makers also took advantage of the physical properties of rare metals | 0.80 | text |
| Chronometer watch | related to External links | American Watchmakers-Clockmakers InstituteFederation | 0.60 | section |
| Chronometer watch | related to External links | Swiss Watch IndustryContrôle Officiel | 0.60 | section |
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