Statements (19)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
scientific instrument
|
| gptkbp:alternativeName |
gptkb:Davis_quadrant
|
| gptkbp:component |
arc
horizon vane shadow vane sighting vane |
| gptkbp:feature |
allows user to keep the sun at their back
|
| https://www.w3.org/2000/01/rdf-schema#label |
backstaff
|
| gptkbp:inventedBy |
16th century
John Davis |
| gptkbp:material |
brass
wood |
| gptkbp:replacedBy |
gptkb:cross-staff
sextant |
| gptkbp:usedBy |
mariners
|
| gptkbp:usedFor |
gptkb:navigation
measuring the altitude of the sun |
| gptkbp:bfsParent |
gptkb:Sextant
|
| gptkbp:bfsLayer |
6
|