418 



Ferguson and Menvin — Melting Points of 



moelectric effect is somewhat doubtful, but probably 

 would lead to too low results. 



The following year Fenner 5 attempted to confirm these 

 results of Endell and Rieke and heated cristobalite in a 

 graphite furnace which had been specially designed to 

 prevent changes in either his charges or the Pt:Pt-Rh 



Fig. 1. 



E2D 



H 



Y777X 



tZD 



Magnesia 



Hard burned 



Fire clay. 



Alundo 



powder 



magnesia. 







thermoelement by the reducing gases. The first deter- 

 minations indicated a melting temperature of 1680° -1690° 

 thus confirming Endell and Rieke, but later he found that 

 by prolonging the time of heating to half-an-hour, traces 

 of fusion could be detected at much lower temperatures 

 and so was led to place the real melting point at 1625°. 



Some doubt, however, was cast upon this value by 

 Bowen, 6 although he made no direct determination of the 



5 C. N. Fenner, loc. cit. 



6 N. L. Bowen, this Journal, 38, 218, 1914. 



