Statements (15)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
Lens
|
| gptkbp:category |
lighthouse
|
| gptkbp:designedBy |
gptkb:Augustin-Jean_Fresnel
|
| gptkbp:diameter |
50 cm
|
| gptkbp:focal_length |
250 mm
|
| https://www.w3.org/2000/01/rdf-schema#label |
fourth-order Fresnel lens
|
| gptkbp:introduced |
19th century
|
| gptkbp:larger_than |
gptkb:fifth-order_Fresnel_lens
|
| gptkbp:material |
gptkb:glass
|
| gptkbp:smaller_than |
third-order Fresnel lens
|
| gptkbp:used_in |
lighthouses
|
| gptkbp:usedFor |
harbor lights
coastal lights |
| gptkbp:bfsParent |
gptkb:Coquille_River_Lighthouse
|
| gptkbp:bfsLayer |
7
|