crown glass - meaning and definition. What is crown glass
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What (who) is crown glass - definition

WIKIMEDIA DISAMBIGUATION PAGE
Crown glass (disambiguation)

crown glass         
¦ noun glass made without lead or iron, originally in a circular sheet, and used as optical glass.
Crown glass (optics)         
TYPE OF GLASS
BK7 glass; Crown optical glass
Crown glass is a type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.
plate-glass         
ANY GLASS MADE IN FLAT SHEETS
Plate Glass; Sheet glass; Plate-Glass; Glass panel; Plate-glass; Glass pane; Glass panels; Flat glass

Wikipedia

Crown glass

Crown glass is either of two kinds of glass:

  • Crown glass (window) was a type of hand-blown window glass.
  • Crown glass (optics) is a type of optical glass used in lenses.