Crown glass

Crown glass
Low dispersion optical glass.
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lime crown glass
an optical crown glass containing substantial quantities of calcium oxide.
limit switch
electromechanical device used to control travel distance.

crown glass ...Edit
Crown glass is a very old kind of glass, once blown into a "crown" to achieve the round elements of medieval glass windows. Its better variants were also used as optical glass.
... and flint glassEdit ...

Kodak had a very advanced glass plant and made their own optical glass. They developed commercially the rare-earth glasses discovered at the National Bureau of Standards and were one of the first manufacturers to use Lanthanum Crown glass.

See also: Optical glass, Illumination, Speed, Application, Mount