A relation between the double refraction and the elastic tension of rubber is derived. The formula which is given defines double refraction as a function of tension up to a certain limiting value of the tension, at which point a strict proportionality between double refraction and tension begins. At this limiting tension the elongation is 70 per cent., and it is noteworthy that at just this elongation X-ray photographs of rubber begin to show fibre diagrams.
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Geel et al. (1929) studied this question.
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