Abstract

In this paper an account is given of an extension of the second method for determining refractive indices of liquids in thin films, previously described in Part I of this series. The apparatus was modified mechanically and optically and an air thermostat built to contain it. The critical angle of reflection from glass to liquid was determined for three normal fatty acids, undecylic, lauric and myristic, in the molten state. The surface layers of the liquid phase were observed to become suddenly birefringent within a narrow range of temperature immediately above the temperature of solidification, thus indicating orientation of the molecules of the molten acid to a depth of at least a wave-length or so of visible light.

© 1933 Optical Society of America

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