4~ 



Sos7nan — Platinum-Rhodium Thermoelement. 



melted, the point being marked by a halt of about one 

 minute in the gradual rise in temperature of the element, 

 preceding the formation of a globule and the interruption of 

 the circuit. New Marquardt tubes were used for each deter- 

 mination. Several elements were examined for contamination 

 after the measurement,^' and no appreciable amount was found. 

 A vertical section of the furnace is shown in tig. 1. 



Fig. 1. 



Water 



CO — > 6^ ^^^ Thermoelement 



Carbon- tube furnace for melting point of platinum. Scale, 1 : 4. 



In Table I are given the experimental results. The values 

 are in microvolts, corrected as discussed in the paper already 

 referred to.f The silver point, being about half way between 

 0° and platinum, is included in order to indicate the general 

 course of the interpolation curve. 



* Method described in Day and Sosman, loc. cit., p. 116. 

 •f-Day and Sosman, loc. cit., p. 115. 



