Larcum Kendall K1 chronometer
E221228
The Larcum Kendall K1 chronometer was an 18th-century marine timekeeper, closely modeled on John Harrison’s H4, that famously demonstrated the practicality of accurate longitude determination at sea.
All labels observed (2)
| Label | Occurrences |
|---|---|
| H4 marine timekeeper | 1 |
| Larcum Kendall K1 chronometer canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1981617 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
Target entity: Larcum Kendall K1 chronometer Context triple: [Second voyage of James Cook, usedInstrument, Larcum Kendall K1 chronometer]
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A.
Longines
Longines is a Swiss luxury watchmaker renowned for its elegant timepieces and long-standing association with equestrian sports and precision timekeeping.
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B.
Horologium Oscillatorium
Horologium Oscillatorium is a landmark 1673 treatise by Christiaan Huygens that laid the foundations of pendulum clock theory and classical mechanics, including an early formulation of the laws of motion and the tautochrone problem.
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C.
U.S. Naval Observatory Master Clock
The U.S. Naval Observatory Master Clock is the primary time standard of the United States, providing ultra-precise reference time for military, governmental, and global positioning system (GPS) operations.
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D.
Clock Museum
The Clock Museum is a specialized museum in Ploiești, Romania, dedicated to the history and display of clocks and timekeeping devices.
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E.
Colgate Clock
The Colgate Clock is a large, historic riverside clock and former advertising landmark located on the Hudson River waterfront in Jersey City, New Jersey.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
Target entity: Larcum Kendall K1 chronometer Target entity description: The Larcum Kendall K1 chronometer was an 18th-century marine timekeeper, closely modeled on John Harrison’s H4, that famously demonstrated the practicality of accurate longitude determination at sea.
-
A.
Longines
Longines is a Swiss luxury watchmaker renowned for its elegant timepieces and long-standing association with equestrian sports and precision timekeeping.
-
B.
Horologium Oscillatorium
Horologium Oscillatorium is a landmark 1673 treatise by Christiaan Huygens that laid the foundations of pendulum clock theory and classical mechanics, including an early formulation of the laws of motion and the tautochrone problem.
-
C.
U.S. Naval Observatory Master Clock
The U.S. Naval Observatory Master Clock is the primary time standard of the United States, providing ultra-precise reference time for military, governmental, and global positioning system (GPS) operations.
-
D.
Clock Museum
The Clock Museum is a specialized museum in Ploiești, Romania, dedicated to the history and display of clocks and timekeeping devices.
-
E.
Colgate Clock
The Colgate Clock is a large, historic riverside clock and former advertising landmark located on the Hudson River waterfront in Jersey City, New Jersey.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
marine chronometer
ⓘ
timekeeping instrument ⓘ |
| accuracy | sufficient for reliable longitude calculation on long voyages ⓘ |
| associatedWith |
Longitude Act
ⓘ
Royal Navy Pacific exploration program ⓘ
surface form:
Royal Navy exploration voyages
|
| basedOn |
John Harrison
ⓘ
surface form:
John Harrison H4 marine timekeeper
|
| chronometerNumber | K1 ⓘ |
| commissionedBy | Board of Longitude ⓘ |
| countryOfOrigin | Kingdom of Great Britain ⓘ |
| demonstrated | practicality of accurate longitude determination at sea ⓘ |
| designer | Larcum Kendall ⓘ |
| displayType | analog ⓘ |
| epochOfUse | 1770s ⓘ |
| era | Age of Sail ⓘ |
| escapementType | detached escapement ⓘ |
| field |
horology
ⓘ
navigation ⓘ |
| function | keep accurate time at sea ⓘ |
| heritage | derivative of Harrison H4 design ⓘ |
| historicalRole | transition from experimental to practical marine chronometers ⓘ |
| influence | development of later marine chronometers ⓘ |
| inspiredBy | John Harrison ⓘ |
| locationOfCreation |
London, England
ⓘ
surface form:
London
|
| maker | Larcum Kendall ⓘ |
| materialUsed |
brass
ⓘ
steel ⓘ |
| measurementQuantity | time ⓘ |
| measurementUnit |
hours
ⓘ
minutes ⓘ seconds ⓘ |
| navigationProblemAddressed | finding longitude at sea ⓘ |
| notability | one of the earliest successful marine chronometers ⓘ |
| notableVoyage | Second voyage of James Cook ⓘ |
| powerSource | spring-driven mechanism ⓘ |
| purpose | determination of longitude at sea ⓘ |
| recognizedBy | Board of Longitude ⓘ |
| scientificSignificance | key evidence in solving the longitude problem ⓘ |
| status | historical artifact ⓘ |
| timePeriod | 18th century ⓘ |
| type | pocket-watch style marine chronometer ⓘ |
| usedBy | James Cook ⓘ |
| usedFor |
celestial navigation
ⓘ
longitude calculation ⓘ |
| usedOnVessel | HMS Resolution ⓘ |
| voyageEndYear | 1775 ⓘ |
| voyageStartYear | 1772 ⓘ |
| yearCompleted | 1770 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Subject: Larcum Kendall K1 chronometer Description of subject: The Larcum Kendall K1 chronometer was an 18th-century marine timekeeper, closely modeled on John Harrison’s H4, that famously demonstrated the practicality of accurate longitude determination at sea.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.