The stress birefringence relation in the alkali halides KBr, KCl and NaCl has been studied employing for the purpose a modified form of Filon's spectrometer method. A linear law is found to hold for stresses ranging from zero to 25kg cm -2 . Curves are given showing the photo-elastic dispersion of these solids.
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Bansigir et al. (1958) studied this question.
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