from Hot Platinum. 
291 
Diagram I. 
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 °/ 0 off 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., 4T8 x 10 -4 amperes or 1*03 x 10“ :} amperes per 
sq. cm. of surface. 
It remains to consider the relation between the experimental 
results and the expression obtained theoretically for the number 
