Abstract
SODIUM chlorate belongs to the tetrahedrite (T) class of the cubic system and exhibits optical activity without birefringence. The birefringence introduced by stress is of the same order as the difference in refractive indices of the two circular components. Special techniques are therefore needed for measuring the photoelastic constants, and the stressing apparatus was so designed that a petrological microscope could be used in conjunction with it.
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RAMACHANDRAN, G., CHANDRASEKHARAN, V. Photoelastic Constants of Sodium Chlorate. Nature 167, 567 (1951). https://doi.org/10.1038/167567a0
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DOI: https://doi.org/10.1038/167567a0
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