Brief descriptions are given of the design and operating principles of the NPL total radiation thermometer. Further measurements of T-T 68 are reported for the temperature range - 130 to +60°C and tabulated with previous measurements made in the range -40 to +100°C. A graph is presented of all the published measurements of T-T 68 from various independent primary thermometers in the range 50 to 400 K, and their relevance to the construction of a reference function for the proposed ITS-90 is discussed.
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Martin et al. (1988) studied this question.
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