The stability at 20 K of five industrialhyphen;type platinumndash;cobalt resistance thermometers on thermal cycling has been studied together with their resistancehyphen;temperature characteristics between 1 and 27 K and their selfhyphen;heating. The stability at 20 K on cycling between room temperature and 20 K is of the order of 10 mK and on cycling between 100 and 20 K is a few mK. Differences in the resistancehyphen;temperature relationships of the thermometers are very small, but the selfhyphen;heating effects are relatively large, particularly below 4 K.
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