Flint glass

Flint" glass`

(?). (Chem.) A soft, heavy, brilliant glass, consisting essentially of a silicate of lead and potassium. It is used for tableware, and for optical instruments, as prisms, its density giving a high degree of dispersive power; -- so called, because formerly the silica was obtained from pulverized flints. Called also crystal glass. Cf. Glass.
[1913 Webster]

The concave or diverging half on an achromatic lens is usually made of flint glass.
[1913 Webster]

 

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Tue 18th December 2018