Statements (18)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:scientific_instrument
|
| gptkbp:alsoKnownAs |
gptkb:Jacob's_staff
|
| gptkbp:category |
gptkb:scientific_instrument
|
| gptkbp:hasPart |
main staff
sliding crosspiece |
| gptkbp:inventedBy |
14th century
|
| gptkbp:length |
typically 60-100 cm
|
| gptkbp:material |
gptkb:wood
|
| gptkbp:originatedIn |
gptkb:Europe
|
| gptkbp:replacedBy |
gptkb:sextant
|
| gptkbp:usedBy |
gptkb:astronomer
navigators |
| gptkbp:usedFor |
determining latitude
measuring angles measuring altitude of celestial bodies |
| gptkbp:bfsParent |
gptkb:backstaff
|
| gptkbp:bfsLayer |
7
|
| https://www.w3.org/2000/01/rdf-schema#label |
cross-staff
|