Society of Glass Technology · [Sheffield] · leaf 139
e takes place whether the alkali presentin the glass is Na20 or K20, or both oxides are in equimolecularproportions, and whatever the amount of R20 present. Thus the glass 100SiO2,20Na2O,15CaO has a Vd value of P5192, * This Journal, Trans., 1920, 4, pp. 78 and 336. 78 JOURNAL OF THE SOCIETY OF… … 1-56 1-54 1-52 ^ioo^M°^\ —i *-ldsiooM^Uxr~
Glass
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