L. A. Guildner, paper presented at the Fifth Symposium on Temperature, Its Measurement and Control in Science and Industry, Washington, D.C., 21 to 24 June 1971. 2. Comite International des Poids et Mesures, Metrologia 5, 35 (1969). 3. H. Plumb and G. Cataland, Int. J. Sci. Metrol. 2, 127 (1966) (see appendix). 4. J. F. Swindells, Ed., Precision Measurement and Calibration, Selected NBS Papers on Temperature (National Bureau of Standards Special Publication 300, Washington, D.C., 1968), vol. 2. 5. L. Haar, paper presented at the Second International Conference on Calorimetry and Thermodynamics, Orono, Maine, 12 to 14 July 1971. 6. T. B. Douglas, J. Res. Nat. Bur. Stand. Sect. A 73, 451 (1969). 7. N. S. Osborne, H. F. Stimson, T. S. Sligh, Jr., C. S. Cragoe, Bur. Stand. U.S. Sci. Pap. No. S.OI (1925). 8. L. Haar, J. Res. Nat. Bur. Stand. Sect. A 72, 207 (1967). 9. H. F. Stimson, personal communication. 10. K. Burgess, J. Res. Nat. Bur. Stand. 1, 635 (1928). 11. H. F. Stimson, ibid. 42, 209 (1949). 12. The very small temperature difference, about 0.010°C, between the triple point and the ice point is readily calculated, and for my purposes I assume that the thermodynamic scale and the practical scale are in agreement at the ice point. 13. Table 4 of (6) includes data for the difference between thermodynamic properties on IPTS. 1968 and ITS-1948. Consider the range 0° to 100'C. From column 3 the maximum value of Cpl/Cp in the range is about 4 X 10-4. From column 2 the maximum value in this range for ,s yields (i/AT)m,, ~ 3 X 10-5. The ratio is about 10. 14. J. F. Masi, H. W. Flieger, J. S. Wicklund, J. Res. Nat. Bur. Stand. 52, 275 (1954). 15. Supported in part by the Office of Standard Reference Data.
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Monica D. Blumenthal (1972) studied this question.