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About: Hyperradiant Fresnel lens     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Whole100003553, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: yago:WikicatLensesyago:Artifact100021939yago:Device103183080yago:Instrumentality103575240yago:Lens103656484yago:Object100002684yago:OpticalDevice103851341yago:PhysicalEntity100001930yago:Whole100003553 New Facet based on Instances of this Class

Hyper-radial or hyperradiant Fresnel lenses are Fresnel lenses used in lighthouses. They are larger than "first-order" lenses, having a focal length (radius) of 1330 mm (52.36 inches). The idea was mentioned by Thomas Stevenson in 1869 and first proposed by John Richardson Wigham in 1872, and again proposed by Thomas Stevenson in 1885 (infringing Wigham's patent).