Abstract
A constant volume gas thermometer made for calibration of resistance thermometers and thermocouples over a temperature range from 4.2 to 100K is described. The absolute temperature was determined by calibrating it at only two known temperatures, for example, boiling points of oxygen and He4. Several sources of error in temperature measurements by use of this gas thermometer were considered, and main error came from pressure measurements. The accuracy of the temperature measurements was better than ±1.9% at 4.2K, ±0.8% at 20K and ±1.0% at 100K.
