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PRECISE MEASUREMENTS OF THE VISCOSITIES OF GLASSES AT TEMPERATURES NEAR THEIR ANNEALING POINTS *
Author(s) -
Lillie H. R.
Publication year - 1932
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.1151-2916.1932.tb13953.x
Subject(s) - glass tube , materials science , annealing (glass) , composite material , viscous flow , mineralogy , silica glass , soda lime glass , glass fiber , flow (mathematics) , tube (container) , optics , mechanics , chemistry , physics
The paper describes a new apparatus for measuring glass viscosities of 10 13 poises and higher. It consists of causing the glass flow to take place inside a steel tube by means of air pressure. The amount of flow is observed by means of interference fringes between the top of the glass sample and a stationary plate of fused silica. Preliminary experiments with two glasses, a lime and a light flint, are described and the results given. A comparison is also made between results by this method and by that of fiber elongation. The new results indicate that the apparatus can he successfully used for observing flow‐pressure relations at extremely high viscosities and also that at the temperatures used these two glasses are purely viscous liquids.