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A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation. It is used to determine longitude by comparing Greenwich Mean Time (GMT) and the time at the current location found from observations of celestial bodies. When first developed in the 18th century, it…
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Marine chronometer | Application | Timekeeping | 1.00 | infobox |
| Marine chronometer | Classification | Clock | 1.00 | infobox |
| Marine chronometer | Industry | Transportation | 1.00 | infobox |
| Marine chronometer | Invented | 1761 | 1.00 | infobox |
| Marine chronometer | Inventor | John Harrison | 1.00 | infobox |
| Marine chronometer | Powered | No | 1.00 | infobox |
| Marine chronometer | is a | precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation | 0.90 | text |
| those set by the Contrôle Officiel Suisse des Chronomètres | 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 |
| Ulysse Nardin made great strides toward incorporating modern production methods | instance of | Swiss makers | 0.80 | text |
| using fully interchangeable parts | instance of | Swiss makers | 0.80 | text |
| but it was only with the onset of World War II that the Hamilton Watch Company in the United States perfected the process of mass production | instance of | Swiss makers | 0.80 | text |
| which enabled it to produce thousands of its Hamilton Model 21 | instance of | Swiss makers | 0.80 | text |
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