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- Reading_stone abstract "A reading stone was an approximately hemispherical lens that was placed on top of text to magnify the letters so that people with presbyopia could read it more easily. Reading stones were among the earliest common uses of lenses.Reading stones were developed in the 8th century, following the development by Abbas Ibn Firnas of a process for converting sand into glass.[citation needed] Glass could be shaped and polished into stones used for viewing.The function of reading stones was replaced by the use of spectacles from the late 13th century onwards, but modern implementations are still used. In their modern form, they can be found as rod-shaped magnifiers, flat on one side, that magnify a line of text at a time; or as a sheet in the form of a Fresnel lens placed over an entire page. The modern forms are usually made of plastic.Early reading stones were manufactured from rock crystal (quartz) or beryl as well as glass.The Visby lenses may have been reading stones.".
- Reading_stone wikiPageExternalLink reading_stone.htm.
- Reading_stone wikiPageID "7353037".
- Reading_stone wikiPageRevisionID "544561782".
- Reading_stone hasPhotoCollection Reading_stone.
- Reading_stone subject Category:Corrective_lenses.
- Reading_stone subject Category:Magnifiers.
- Reading_stone type Artifact100021939.
- Reading_stone type CorrectiveLenses.
- Reading_stone type Device103183080.
- Reading_stone type Instrument103574816.
- Reading_stone type Instrumentality103575240.
- Reading_stone type Lens103656484.
- Reading_stone type Magnifier103709206.
- Reading_stone type Magnifiers.
- Reading_stone type Object100002684.
- Reading_stone type OpticalDevice103851341.
- Reading_stone type PhysicalEntity100001930.
- Reading_stone type ScientificInstrument104147495.
- Reading_stone type Whole100003553.
- Reading_stone comment "A reading stone was an approximately hemispherical lens that was placed on top of text to magnify the letters so that people with presbyopia could read it more easily.".
- Reading_stone label "Lesestein (Optik)".
- Reading_stone label "Piedra de Lectura".
- Reading_stone label "Reading stone".
- Reading_stone sameAs Lesestein_(Optik).
- Reading_stone sameAs Piedra_de_Lectura.
- Reading_stone sameAs m.025_286.
- Reading_stone sameAs Q1820708.
- Reading_stone sameAs Q1820708.
- Reading_stone sameAs Reading_stone.
- Reading_stone wasDerivedFrom Reading_stone?oldid=544561782.
- Reading_stone isPrimaryTopicOf Reading_stone.