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DIMENSIONAL CHANGES CAUSED IN GLASS BY HEATING CYCLES 1
Author(s) -
Tool A. Q.,
Lloyd D. B.,
Merritt G. E.
Publication year - 1930
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1930.tb16317.x
Subject(s) - annealing (glass) , materials science , mineralogy , specific heat , thermodynamics , composite material , analytical chemistry (journal) , chemistry , physics , chromatography
In obtaining expansivity curves for a medium flint glass, samples of the glass were tested which had previously received one or another of several different heat treatments, and in these tests heating cycles were employed which made it possible to determine that the magnitude of the so‐called “permanent” changes in length are caused either by the annealing or the “disannealing” which may result from the heat treatment imposed on the glass by the heating cycle employed. Annealing decreases the length and specific volume, while disannealing increases them. It is shown that these effects are related to certain ice‐point shifts observed in thermometers, and to other effects sometimes observed in various types of glassware.