Society of Glass Technology · [Sheffield] · leaf 145
g glasses. (2) In every case, the refractive index and total dispersion ofthe glass containing half its molecular oxide content as Na20 andhalf as K20 are intermediate between the refractive index andtotal dispersion of the corresponding glasses containing only Na20and K20 respectively. The values… … 15 20 Molecules CaO. Fig. 4. THE DEVELOPMENT OF VARIOUS TYPES OF GLASS. PART V. 81 (3) In the series 100SiO2,40R2O,a:CaO, where the molecular CaOvalue is greater than 75, the Na20 glass has a higher refractiveindex for the D line than the corresponding K20 glass. From Fig. 4 1000 900 Total…
Glass
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