First-order Fresnel lens

GPTKB entity

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