A high-temperature X-ray camera has been designed for taking powder photographs which show well-resolved K α doublets at high angles of reflection, enabling an accurate estimate of line position to be made. The temperature of the specimen was found in the following way. Photographs of silver, from which the lattice dimensions were calculated, were taken with varying heating currents. The coefficient of expansion of silver was used to convert lattice-spacing measurements to degrees centigrade. A curve relating the watts in the furnaces to the temperature of the specimens was thus obtained. A test of the reliability of the method was carried out by means of X-ray experiments on the expansion of quartz and the conclusion reached was that the assumption regarding the expansion of silver was valid. The temperature scale thus calculated was found to be correct to within 5°C.
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Antoine Jay (1933) studied this question.