Society of Glass Technology · [Sheffield] · leaf 497
ct of introducing zinc oxide and magnesiumoxide into the glass with that of other oxides, namely, of lead,barium, strontium, and calcium oxides previously recorded. Thefollowing table shows that the greater the molecular weight of theoxide introduced the greater the effect on the density of… … 15 20 £5 Molecules RO.Fig. 76. 15 20 25 Percentage RO{Sodium Oxide 20 per cent.). Fig. 77. Figs. 68 and 69 set out graphically the density relationshipsboth on the basis of percentage and molecular composition. In glasses of the type 100SiO2,20Na2O,RO the greater the mole-cular weight of the RO…
Glass
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