|
gptkbp:instanceOf
|
Lens
|
|
gptkbp:category
|
Lens
|
|
gptkbp:diameter
|
approximately 2.59 meters
|
|
gptkbp:effect
|
high light transmission
|
|
gptkbp:hasLighting
|
later electric lamp
originally oil lamp
|
|
gptkbp:height
|
920 mm
about 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:largestTypeOf
|
Lens
|
|
gptkbp:material
|
gptkb:glass
|
|
gptkbp:notableExample
|
gptkb:Pigeon_Point_Lighthouse
gptkb:Cape_Hatteras_Lighthouse
gptkb:Makapu'u_Point_Lighthouse
|
|
gptkbp:order
|
first
|
|
gptkbp:practicedWorldwide
|
yes
|
|
gptkbp:purpose
|
to focus light for navigation
|
|
gptkbp:refractiveIndex
|
about 1.5
|
|
gptkbp:replacedBy
|
earlier parabolic reflectors
|
|
gptkbp:revolutionized
|
lighthouse technology
|
|
gptkbp:shape
|
multi-part concentric rings
|
|
gptkbp:usedFor
|
maritime navigation
|
|
gptkbp:usedIn
|
lighthouses
|
|
gptkbp:weight
|
up to several tons
|
|
gptkbp:bfsParent
|
gptkb:Pensacola_Lighthouse
gptkb:Cape_Sarichef_Light
gptkb:Point_Reyes_Lighthouse
gptkb:Point_Sur_Lighthouse
gptkb:Absecon_Lighthouse
gptkb:Tillamook_Rock_Light
gptkb:Cape_Meares_Lighthouse
gptkb:Cape_Mendocino_Lighthouse
gptkb:Yaquina_Head_Lighthouse
gptkb:Grays_Harbor_Lighthouse
gptkb:Tillamook_Rock_Lighthouse
|
|
gptkbp:bfsLayer
|
6
|