Society of Glass Technology · [Sheffield] · leaf 135
tionof lead oxide is greater than that due to lime. Thus, if a moleculeof PbO is added to the glass 100SiO2,20Na2O,5PbO the rise indensity is 0057, whilst the addition of one molecule of CaO to theglass 100SiO2,20Na2O,5CaO only raises the density 0*009. (3) In the CaO series, the addition of alkali… … 15 20 25 Molecules R0.Fig. 2. B.—Comparison by Percentage Weight. Table I gives the densities of glasses of the aSi02,6R20,cR0type, where (a + b -\- c) — 100 per cent., R20 being either Na20or K20, and R0 being either lime or lead oxide. Table I. Percentage of oxides. Na20 glasses. K20 glasses.…
Glass
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