Statements (23)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
surveying instrument
|
| gptkbp:component |
mirror
spirit level sighting tube vernier scale bubble tube graduated arc protractor scale |
| https://www.w3.org/2000/01/rdf-schema#label |
Abney level
|
| gptkbp:introducedIn |
late 19th century
|
| gptkbp:inventedBy |
gptkb:Sir_William_de_Wiveleslie_Abney
|
| gptkbp:measures |
vertical angles
horizontal angles |
| gptkbp:operatedBy |
one person
|
| gptkbp:portable |
yes
|
| gptkbp:used_in |
forestry
geology surveying |
| gptkbp:usedFor |
measuring angles of depression
measuring angles of elevation measuring slopes |
| gptkbp:bfsParent |
gptkb:Sir_William_de_Wiveleslie_Abney
|
| gptkbp:bfsLayer |
6
|