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- W4233266507 abstract "EVERYONE who makes chemical apparatus by blowing glass practises annealing in a rude way. by allowing the glass to cool slowly by g actual removal from the flame, or by the use of a smoky flame. In glass works more systematic annealing is effected by slow passage through a long chamber wherein the temperature falls from the incoming to the outgoing end. In the manufacture of optical glass of many different qualities the question of annealing is one of the first importance, as they differ so much in fusibility. Messrs. Hilger have after a careful investigation found the means of arriving at the maximum temperature necessary, and also the necessary rate of cooling, which may progressively become more rapid. Optical glasses may differ as much as 200° C. in the maximum necessary temperature, which temperature may be a long way below any visible softening point. It is desirable not to exceed the necessary temperature, as the very slow cooling at the higher temperature leads to great loss of time." @default.
- W4233266507 created "2022-05-12" @default.
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- W4233266507 date "1916-10-01" @default.
- W4233266507 modified "2023-10-17" @default.
- W4233266507 title "Annealing Glass" @default.
- W4233266507 doi "https://doi.org/10.1038/098150b0" @default.
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