John Harrison's marine timekeeper H4
GPTKB entity
Statements (22)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
marine chronometer
|
| gptkbp:accuracy |
lost only 5 seconds on transatlantic voyage
|
| gptkbp:awardedBy |
gptkb:Board_of_Longitude
|
| gptkbp:balanceSpring |
yes
|
| gptkbp:completedIn |
1759
|
| gptkbp:diameter |
13 cm
|
| gptkbp:displayType |
yes
watch-like dial |
| gptkbp:escapement |
detent escapement
|
| https://www.w3.org/2000/01/rdf-schema#label |
John Harrison's marine timekeeper H4
|
| gptkbp:influenced |
development of marine chronometers
|
| gptkbp:inventedBy |
gptkb:John_Harrison
|
| gptkbp:location |
gptkb:Royal_Observatory,_Greenwich
|
| gptkbp:material |
brass
|
| gptkbp:mechanismOfAction |
spring-driven
|
| gptkbp:powerReserve |
over 30 hours
|
| gptkbp:purpose |
solving the longitude problem
|
| gptkbp:significance |
first successful marine timekeeper
|
| gptkbp:testedBy |
voyage to Jamaica, 1761-1762
|
| gptkbp:weight |
1.45 kg
|
| gptkbp:bfsParent |
gptkb:John_Harrison's_marine_timekeeper_H5
|
| gptkbp:bfsLayer |
6
|