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词汇 Reading stone
分类 英语词汇 英语翻译词典
释义

Reading stone

原声例句
TED演讲(音频版) 2020年2月合集

The first vision aid was called a reading stone and was invented over 1,000 years ago.

第一个助视器被称为阅读石,是在 1000 多年前发明的。

英语百科

Reading stone

Reading stone in Archeon, a historical theme park

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.

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