Society of Glass Technology · [Sheffield] · leaf 674
thisJournal, 1921, Abs. No. 103, and 1922, Abs. No. 191).—Thefirst attempts to fix annealing temperature were, according to theauthors, made by Schott, who observed a strongly strained cylinderof glass, with parallel ends, between crossed Nicols, and noted thechange in the number of rings when the… … 300° 400( Temperature.Fig. 185. temperature, below which the glass was completely hard, was 370°.Zschimmer, later, showed that these temperatures depended onthe composition of the glass, the limits being 600° and 450°.Zschimmer and Schulz together, and Schulz alone, fixed the tem-peratures…
Glass
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