Society of Glass Technology · [Sheffield] · leaf 416
e compared, a mean rise in densityof 0-0089 for (1 per cent, of Na20 -1 per cent, of SiOo) is obtained.The corresponding rise for (1 per cent, of K20 -1 per cent, of SiOo)is 0-0074. Therefore, when Si02 is substituted in a glass of thistype by alkali per cent, for per cent, there is a rise in… … 3 3-0 10 20 30 Percentage of lead oxide. of sodium oxide, it will be seen that there is a mean rise in densityfor (1 per cent, of PbO -1 per cent, of SiO,) of 0-0284. The corre-sponding rise for the potash glasses (1 per cent, of PbO -1 per cent,of Si02) is 0-0276. Thus when Si02 is substituted in…
Glass
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