Statements (23)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
time signal device
|
| gptkbp:category |
gptkb:navigation
horology public timekeeping |
| gptkbp:deployment |
1829
|
| gptkbp:firstPerformed |
gptkb:Portsmouth,_England
|
| https://www.w3.org/2000/01/rdf-schema#label |
Time Ball
|
| gptkbp:inventedBy |
gptkb:Robert_Wauchope
|
| gptkbp:mechanismOfAction |
ball drops down a pole
|
| gptkbp:notableExample |
Greenwich Observatory Time Ball
Sydney Observatory Time Ball United States Naval Observatory Time Ball |
| gptkbp:operatedBy |
dropping at a predetermined time
|
| gptkbp:relatedTo |
chronometer
noon mark time gun |
| gptkbp:replacedBy |
radio time signals
|
| gptkbp:status |
historical device
|
| gptkbp:usedBy |
public
mariners |
| gptkbp:usedFor |
signaling precise time to ships and the public
|
| gptkbp:bfsParent |
gptkb:The_Royal_Observatory,_Greenwich
|
| gptkbp:bfsLayer |
7
|