382 BRIDGMAN. 



obvious from the fact that the relation between e.m.f. and tempera- 

 ture at constant pressure has been in most cases approximately linear. 

 The columns of pressure effect on Peltier heat and Thomson heat 

 are not obviously related. Most striking is the transposition of Bi 

 from the head of one column to the bottom of the other ; the pressure 

 effect on Peltier heat of Bi is the maximum positive, and on the Thom- 

 son heat the maximum negative. One draws the conclusion that the 



TABLE XLVI. 



Ration of Maximum Change of Thomson Heat within the Range 0°-100° 

 C and O to 12000 KG. /cm.- to Thomson Heat at 0°C and O kg. 



Thomson heat mechanism and the Peltier heat mechanism are not 

 intimately related. The pressure effect on Thomson heat inclines 

 to show parallelism to the pressure effect on resistance. 



The thermo-electric behavior at atmospheric pressure (Peltier 

 heat against lead and Thomson heat) also shows little direct con- 

 nection with the pressure effects. There is no obvious connection 

 between other pairs of columns; the thermo-electric mechanism 

 seems to stand in a class by itself. 



