Society of Glass Technology · [Sheffield] · leaf 134
,40Na2O,5CaO only raisesthe density 0006. (3) Whatever the value of x when R20 is represented by Na20,the glass has a higher density than the corresponding K20 glass,whether it contains PbO or CaO. THE DEVELOPMENT OF VARIOUS TYPES OF CLASS. PART X. 73 (4) The glasses containing both Na20 and K20… … 5 10 15 20 25 30 x = Molecules R0.Fig. 1. Fig. 2 shows diagrammatically the densities of the molecularseries 100SiO2,20R2O,;zCaO and 100SiO2,20R2O,»;PbO, and thefollowing points deserve notice :— (1) The substitution of PbO for CaO in glasses of this type,molecule for molecule, results in a large…
Glass
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