Platinum-iridium and of Platinum-rhodium. 



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Chart showing the relation of the electromotive force (microvolts), of the 20 per cent, 

 iridioplatinum thermocouple (abscissas), and of the 10 per cent, rhodioplatinum 

 thermocouple (ordinates), when the cold junction is kept at 20° C, and the hot 

 junction carried through a temperature interval of over 1700° C. Above 1200°, the 

 prolonged linear locus- is dotted. The successive temperature regions are indicated 

 below the curve. 



