145and interfacial tensions) are a measure of the net rate overemphasized. Further studies may show that of solution of cord glass, whether the cord is immersed various other physical properties of molten glasses or floating. The importance of surface tension in the have greater influences than has surface tension. persistence of cords in glass, however, should not be PRESTON LABORATORIES BUTLER, PENNSYLVANIA ABSTRACT 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.
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