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 (gas) scale from the IPTS-68 scale and from the ITS-90 scale in the range 13 K to 308 K were found.

The author was privileged to complete the development of a photoelectric pyrometer at NBS that was based on preliminary studies and experimental work of C. P. JOHNSON, G. ZIEQLER and D. E. ERMINY. The photoelectric pyrometer was completed in the Radiation Thermometry Section under the direction of H. J. KOSTKOWSKJ, Section Chief. The innumerable discussions with him were of great value to the author. Most of the instrument was constructed by A. N. GRAEF and W. GROTE. Finally, the author wishes to thank E. LEWIS for his assistance in pyrometer calibrations and other work.

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