About: The ability of a segment of a glass sphere to magnify whatever is placed before it was known around the year 1000, when the spherical segment was called a reading stone, essentially what today we might term a frameless magnifying glass or plain glass paperweight.

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About: The ability of a segment of a glass sphere to magnify whatever is placed before it was known around the year 1000, when the spherical segment was called a reading stone, essentially what today we might term a frameless magnifying glass or plain glass paperweight. Sponge NotDistinct Permalink

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rdf:value	The ability of a segment of a glass sphere to magnify whatever is placed before it was known around the year 1000, when the spherical segment was called a reading stone, essentially what today we might term a frameless magnifying glass or plain glass paperweight. (en)
Bibliographic Citation	2013 September-October, Henry Petroski, “The Evolution of Eyeglasses”, in American Scientist: (en)
is skos:example of	dbnary-eng:__ws_1_glass__Noun__1

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