Society of Glass Technology · [Sheffield] · leaf 300
— iyc) values between thecorresponding sodium and potash glasses. (2) Fig. 2 shows the rise in the refractive index of the D line asthe percentage of barium oxide increases and the alkali decreases,the silica remaining constant. Two series of results are shown,namely, for 70 per cent, and 60 per… … 20 15 25 20 Percentage of alkali. 15 will be observed (a) that as the barium oxide increases and thealkali decreases the refractive index increases, (6) the sodium oxideglasses have a higher refractive index than the correspondingpotassium oxide glasses. Glasses containing both alkalies in…
Glass
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