from Hot Platinum. 



291 



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210 



200 



180 



160 



140 



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100 



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60 



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1010 ,50 90 /30 /70 2/0 250 

 TEMPERATURE CENTIGRADE. 

 Diagram I. 



2qo 



The subjoined table gives a further series of observations for 

 somewhat higher temperatures. The agreement here is not so 

 good, the individual observations being liable to be 20 °/ °ff the 

 curve. Shortly above the highest temperature (1600°) the wire 

 gave so that it was not possible to take the observations further. 

 The most important thing is the relatively enormous current 

 registered, viz., 418 x 10~ 4 amperes or 103 x 10 _:i amperes per 

 sq. cm. of surface. 



It remains to consider the relation between the experimental 

 results and the expression obtained theoretically for the number 



