New measurements of the thermal expansion of the copper used to manufacture the VNIIFTRI gas thermometer were performed and the temperature scale was corrected. The deviations of recalculated T(gas) scale from the IPTS-68 scale and from the ITS-90 scale in the range 13 K to 308 K were found.

In 1964 the authors published preliminary results of their work on establishing the practical temperature scale in the temperature range from 4.2 K to 20 K [I].