The reproducibility of the International Practical Temperature Scale of 1968 (IPTS-68) in the region of 13. 81 K to 90. 188 K using standard platinum resistance thermometers is discussed. The effect of errors above 0 degree C on the calibration between 13 and 90 K is analyzed. Calibration resulting from least squares and ″fixed point″ treatment of the data are compared.
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Furukawa, G. T., Riddle, J. L., & Bigge, W. R. (1973). INTERNATIONAL PRACTICAL TEMPERATURE SCALE OF 1968 IN THE REGION 13. 81 K TO 90. 188 K AS MAINTAINED AT THE NATIONAL BUREAU OF STANDARDS. J Res Nat Bur Stand Sect A Phys Chem, 77 A(3), 309–332. https://doi.org/10.6028/jres.077A.019