Society of Glass Technology · [Sheffield] · leaf 414
e glasses of the 100SiO2,20R2O,«PbO series have a higherdensity than the glasses of the 100SiO2,40R2O,,£PbO for correspond-ing values of x when the lead oxide content is greater than 10 mole-cules. Thus, above 10 molecules of lead oxide, the addition ofalkali causes the density to fall. The broken… … 10 15 20 25 x= Molecules of PbO. the glasses will be found in Table I, the melt number, set, andsection letter being given to facilitate cross-reference. The following points are obvious from a study of this table: (1) In every case investigated (Si02 between 30 and 70 per cent.,PbO between 5 and…
Glass
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