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
|