Statements (23)
Predicate | Object |
---|---|
gptkbp:instanceOf |
Lens
|
gptkbp:category |
Lens
|
gptkbp:component |
lighthouse lantern room
|
gptkbp:diameter |
approximately 2.59 meters
|
gptkbp:height |
920 mm
approximately 2.59 meters |
https://www.w3.org/2000/01/rdf-schema#label |
First-order Fresnel lens
|
gptkbp:introducedIn |
1820s
|
gptkbp:inventedBy |
gptkb:Augustin-Jean_Fresnel
|
gptkbp:largestOrder |
true
|
gptkbp:material |
gptkb:glass
|
gptkbp:order |
first
|
gptkbp:purpose |
to focus light into a powerful beam
|
gptkbp:replacedBy |
earlier parabolic reflectors
|
gptkbp:usedFor |
aiding navigation
increasing lighthouse visibility |
gptkbp:usedIn |
gptkb:Pigeon_Point_Lighthouse
gptkb:Cape_Hatteras_Lighthouse gptkb:Makapu'u_Point_Lighthouse lighthouses |
gptkbp:weight |
up to several tons
|
gptkbp:bfsParent |
gptkb:Pigeon_Point_Lighthouse
|
gptkbp:bfsLayer |
5
|