THERMO-ELECTRIC EFFECTS OF LONG. TENSION IN DTFF. METALS. (^5 



§ 39. In the sixth place, silver. The specimen was not pure 

 and being-, further, very thin (0*26 m.m. in diameter) could not he 

 loaded with more than 2'5 kilos. The thermo-electric E. M. F. was 

 specially small and seemed to have been vitiated by extraneous 

 E. M. F. The result of the measurements is given in the following- 

 table and graphically represented in Fig. 8, PI. IV . The E. M. F. 

 seems to decrease as the load is increased, a result contrary to that 

 obtained by Prof. Ewingf. 



§ 40. In the seventh place, copper. The specimen (0*8 m.m. 

 in diameter) was commercical and was tested in hard drawn state. 

 Here on account of being somewhat free from extraneous E. M. F. at 

 the junctions, the readings taken, though small, were very regular 



