The thermal endurance of borosilicate glasses in the form of perfectly annealed rods of five different diameters was studied. Temperature distribution in the rods, therma1 stress, relation between radius of rod and critical thermal shock are mathematically discussed from observed data. A new expression showing the relation between the radius of the rods and the minimum temperature difference to cause fracture in the rods is developed
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Tabata et al. (1934) studied this question.