Although the IPTS-68 is meant to be a close approximation to thermodynamic temperatures, its definition makes no provision for continuity in dt/dt68 at 630.74 " C . Any discontinuity in dt/dt68 at 630.74 " C is directly related to the corresponding discontinuity in the first derivative with respect to t6g of sensor output, so the former can be obtained from measurement of the latter. The magnitude of the discontinuity has not previously been measured precisely: it has an important bearing on elucidating the behaviour of ( t -i 6 g ) near 630.74"C. Over the temperature range from about 610 "C to 645 "C two calibrated platinum resistance thermometers, nine platinum -1Ooh rhodium/platinum thermocouples, and two other types of thermocouples have been intercompared in an experimental arrangement designed expressly to measure the discontinuity. The result for the relative discontinuity in dt/dt6g at 630.74 "C was found to be 0.51 k 0.10 percent.
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