THERMO-ELECTRIC QUALITY UNDER PRESSURE. 



299 



QO 20° 



40° 60° 

 Temperature 



80'^ 1 00° 20° 

 Lead 



40° 60° 

 Temperature 



80° 



100°.^ 

 H 



FrnuRE 9. Lead. On the left, the heat absorbed by unit quantity of 

 electricity on flowing from uncompressed metal to metal compressed to the 

 pressure indicated on the curves, as a function of temperature. On the right, 

 the excess of Thomson heat in metal compressed to the pressure indicated on 

 the curves over uncompressed metal, as a function of temperature. 



TABLE VIL 



Lead. 



Thermo-electromotive Force, volts X 10^. 



