Abstract
The absolute thermoelectric power of lead has been determined by direct measurement of its Thomson heat from 10 to 350 K. The scale established by Christian, Jan, Pearson and Templeton (1958) is found to be in error above 20 K by as much as 0·3μV/K. The error significantly affects the analysis of thermopowers which are less than 3μV/K above about 40 K.