32 



K. TSURUTA. 



loading and unloading, and the vertical axis that of E. M. F., con- 

 sidered as positive in the sense of from below upwards. 



The iron wire was found initially to give a current from the part 

 nffected to the part unaffected through the hot junction : the repre- 

 sentative point has accordingly a positive ordinate (Fig. 1). On 

 being loaded, the E. M. F. was so reduced that, even under the load of 

 3 kilos., the representative point passes over far below the axis of load. 

 On being unloaded, the E. M. F. assumed a still more negative value, 

 and passing through a minimum, it showed a tendency to turn back 

 towards the positive side, though never attaining its initial magnitude. 

 The second process of loading and unloading gave a curve which 



