Statements (18)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
Lens
|
| gptkbp:category |
lighthouse
Lens |
| gptkbp:diameter |
approximately 2.6 meters
|
| gptkbp:feature |
concentric rings
prismatic sections |
| gptkbp:height |
700 mm
|
| https://www.w3.org/2000/01/rdf-schema#label |
Second order Fresnel lens
|
| gptkbp:introducedIn |
19th century
|
| gptkbp:inventedBy |
gptkb:Augustin-Jean_Fresnel
|
| gptkbp:material |
gptkb:glass
|
| gptkbp:order |
second
|
| gptkbp:purpose |
focus light into a beam
|
| gptkbp:usedFor |
coastal lighthouses
harbor lighthouses |
| gptkbp:usedIn |
lighthouses
|
| gptkbp:bfsParent |
gptkb:Gay_Head_Light
|
| gptkbp:bfsLayer |
5
|