Society of Glass Technology · [Sheffield] · leaf 495
hty. The author pointed out that in certain glasses, particularly densebarium crown glasses, it was almost impossible to remove all thegas bubbles. Of the glass produced, at least 50 per cent, wasusually rejected on examination for defects such as striae, stones,and bad bubbles, whilst after the… … Fig. 68. 25 20 15 /4i 0~ //r ^ ..■;:/ S0^ ./■ ;■ J^Sno^ *gP 5 10 15 Fig. 69.
Glass
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