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- Visby_lenses abstract "The Visby lenses are a collection of lens-shaped manufactured objects made of rock crystal (quartz) found in several Viking graves on the island of Gotland, Sweden, and dating from the 11th or 12th century. Some were in silver mounts with filigree, the mounting covering the back of the lens, and were probably used as jewellery; it has been suggested that the lenses themselves are much older than their mounts. Some of the lenses can be seen at the Fornsal historical museum in Visby, while some are in the Swedish National Museum in Stockholm, and others have been lost.It was reported by Otto Ahlström in 1950 that most have aspheric surfaces. The best of the lenses have low spherical aberration, indicating that their surface profile was optimized to improve image quality. Most of the lenses, however, do not show any sign of optimization and produce worse images than a simple spherical lens.".
- Visby_lenses thumbnail Viking_crystal_ball.jpg?width=300.
- Visby_lenses wikiPageExternalLink Frojel99.pdf.
- Visby_lenses wikiPageExternalLink jewellery_as_form_of_personal_expression.htm.
- Visby_lenses wikiPageExternalLink 22visby.pdf.
- Visby_lenses wikiPageExternalLink makeframe.html?22visb.htm.
- Visby_lenses wikiPageExternalLink visby.htm.
- Visby_lenses wikiPageID "1245299".
- Visby_lenses wikiPageLength "6054".
- Visby_lenses wikiPageOutDegree "23".
- Visby_lenses wikiPageRevisionID "688145497".
- Visby_lenses wikiPageWikiLink Angular_resolution.
- Visby_lenses wikiPageWikiLink Aspheric_lens.
- Visby_lenses wikiPageWikiLink Byzantium.
- Visby_lenses wikiPageWikiLink Category:Germanic_archaeological_artifacts.
- Visby_lenses wikiPageWikiLink Category:Lenses.
- Visby_lenses wikiPageWikiLink Category:Viking_Age_art.
- Visby_lenses wikiPageWikiLink Constantinople.
- Visby_lenses wikiPageWikiLink Ellipse.
- Visby_lenses wikiPageWikiLink Filigree.
- Visby_lenses wikiPageWikiLink Fröjel.
- Visby_lenses wikiPageWikiLink Gotland.
- Visby_lenses wikiPageWikiLink Lens_(geometry).
- Visby_lenses wikiPageWikiLink Nationalmuseum.
- Visby_lenses wikiPageWikiLink Nimrud_lens.
- Visby_lenses wikiPageWikiLink Parabola.
- Visby_lenses wikiPageWikiLink Quartz.
- Visby_lenses wikiPageWikiLink Reading_stone.
- Visby_lenses wikiPageWikiLink Silver.
- Visby_lenses wikiPageWikiLink Stockholm.
- Visby_lenses wikiPageWikiLink Telescope.
- Visby_lenses wikiPageWikiLink Visby.
- Visby_lenses wikiPageWikiLink File:Viking_crystal_ball.jpg.
- Visby_lenses wikiPageWikiLink File:Visby-Linse.svg.
- Visby_lenses wikiPageWikiLinkText "Visby lenses".
- Visby_lenses wikiPageUsesTemplate Template:Commons_category.
- Visby_lenses wikiPageUsesTemplate Template:Convert.
- Visby_lenses wikiPageUsesTemplate Template:Reflist.
- Visby_lenses subject Category:Germanic_archaeological_artifacts.
- Visby_lenses subject Category:Lenses.
- Visby_lenses subject Category:Viking_Age_art.
- Visby_lenses hypernym Collection.
- Visby_lenses type Book.
- Visby_lenses type List.
- Visby_lenses type Artifact.
- Visby_lenses type List.
- Visby_lenses type Object.
- Visby_lenses type Page.
- Visby_lenses comment "The Visby lenses are a collection of lens-shaped manufactured objects made of rock crystal (quartz) found in several Viking graves on the island of Gotland, Sweden, and dating from the 11th or 12th century. Some were in silver mounts with filigree, the mounting covering the back of the lens, and were probably used as jewellery; it has been suggested that the lenses themselves are much older than their mounts.".
- Visby_lenses label "Visby lenses".
- Visby_lenses sameAs Q1573322.
- Visby_lenses sameAs Visby-linserne.
- Visby_lenses sameAs Visby-Linsen.
- Visby_lenses sameAs Lenti_di_Visby.
- Visby_lenses sameAs m.04lr8m.
- Visby_lenses sameAs Visbylinserna.
- Visby_lenses sameAs Q1573322.
- Visby_lenses wasDerivedFrom Visby_lenses?oldid=688145497.
- Visby_lenses depiction Viking_crystal_ball.jpg.
- Visby_lenses isPrimaryTopicOf Visby_lenses.