Society of Glass Technology · [Sheffield] · leaf 422
ng statement: (+1% PbO-l%Si02) = + 0-0034 = rise in vn = + 0-00026 = rise in total dispersion(41% PbO - 1 %Si02) = + 0-0034 =rise in vD = 4-0-0026 =rise in total dispersionJ- (+1% PbO-l%Si02) = 4-0-0034 =risein7jD = 4- 0-00025 = rise in total dispersion. (11) A comparison of the numbers obtained in… … 10 20 30 Percentage of PbO. pen sate, the alkali being kept constant, the rise in the refractiveindex of the ZMine and in the total dispersion is greater than if1 per cent, of alkali were subtracted to compensate, the silica beingkept constant. This once more emphasises the point that it is…
Glass
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