Definitions for reading stone
read·ing stone

WiktionaryRate this definition:0.0 / 0 votes

1. reading stonenoun

   A hemisphere of glass used as a magnifier when placed with its flat side against a surface with text.

WikipediaRate this definition:0.0 / 0 votes

1. Reading stone

   A reading stone is an approximately hemispherical lens that can be placed on top of text to magnify the letters so that people with presbyopia can read it more easily. Reading stones were among the earliest common uses of lenses. The invention of reading stones is often credited to Abbas ibn Firnas in the 9th century, although the regular use of reading stones only began around 1000 AD. Early reading stones were manufactured from rock crystal (quartz) or beryl as well as glass, which could be shaped and polished into stones used for viewing. The Swedish Visby lenses, dating from the 11th or 12th century, may have been reading stones. 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 large dome magnifiers which magnify a circular area of a page. Larger Fresnel lenses can be placed over an entire page. The modern forms are usually made of plastic.

WikidataRate this definition:0.0 / 0 votes

1. Reading stone

   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. 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 or beryl as well as glass. The Visby lenses may have been reading stones.

How to pronounce reading stone?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say reading stone in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of reading stone in Chaldean Numerology is: 9

2. Pythagorean Numerology

   The numerical value of reading stone in Pythagorean Numerology is: 5

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Reading_Stone
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Reading_Stone
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=reading stone