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SURFACE LAYER OF SHEET GLASS *
Author(s) -
Bishop F. L.
Publication year - 1944
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.1151-2916.1944.tb14883.x
Subject(s) - refractive index , refraction , prism , optics , layer (electronics) , flat glass , reflection (computer programming) , materials science , absorption (acoustics) , mineralogy , atmosphere (unit) , surface layer , composite material , geology , meteorology , physics , computer science , programming language
A bstract This research was conducted to obtain evidence of the nature of the fire polish on sheet glass. Three measurements were made on each sample as follows: (1) The deviations from Fresnel's reflection laws, (2) a measurement based on the Pfund method of determining the apparent Brewsterian angle as compared to that calculated from the index of refraction of the glass, and (3) the true index of refraction by a prism method in which the samples were cut and ground to 60‐degree prisms. These measurements showed that freshly drawn sheet glass probably has a crystalline layer several molecules thick on the surface. The layer has a high index of refraction, but this is counteracted quickly by water absorption if the glass is dampened slightly or is exposed to the atmosphere.