Details have been given of the construction of thermocouples suitable for
temperature measurements on skin surfaces and in living tissue. The sources of
error have been discussed, and tests of the accuracy of the method have been
described. It is concluded that, with adequate precautions, the following degree
of accuracy was attained :
Skin Surface Instrument - Random errors, ±0·14°C.; systematic
errors, less than - 0·2°C. per 10°C. temperature difference between skin
Hypodermic Instrument - Random errors, ± 0·1°C.; systematic
errors, less than 0·1°C. per 10°C. temperature difference between
tissue and air.
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