Accurate polynomial representation of the T58 He4 scale of temperature from 1.6 K to the critical point

This paper presents an interpolation formula for converting the 1958 He⁴ scale of vapour pressure measurements to temperature, which is a significant improvement on all previous formulae. The T58 scale was fitted into seventeen segments — three below the lambda point and fourteen above. The polynomials obtained from this formulae can easily be incorporated into computer programmes.