Statements (23)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
Type of glass
|
| gptkbp:color |
Colorless
|
| gptkbp:component |
Calcium oxide (CaO)
Potassium oxide (K2O) Silica (SiO2) Sodium oxide (Na2O) |
| gptkbp:contrastsWith |
gptkb:Flint_glass
|
| gptkbp:firstProduced |
17th century
|
| gptkbp:has_low |
Dispersion
Refractive index |
| gptkbp:hasProperty |
Low cost
Good optical clarity |
| https://www.w3.org/2000/01/rdf-schema#label |
Crown glass
|
| gptkbp:manufacturer |
Blowing and spinning
|
| gptkbp:used_in |
gptkb:Spectacles
Achromatic doublets Historic window panes Microscope objectives Telescope objectives |
| gptkbp:usedFor |
gptkb:Windows
Optical lenses |
| gptkbp:bfsParent |
gptkb:Refracting_telescope
|
| gptkbp:bfsLayer |
7
|