650 



BURGESS AND SCOTT: CRITICAL RANGES OF IRON 



PHYSICAL CHEMISTRY. — Thermoelectric measurement of the 

 critical ranges of pure iron. 1 George K. Bcrgess and H. 

 Scott, Bureau of Standards. 



The methods hitherto employed for the determination of the 

 thermoelectric properties of conducting materials possess the 

 characteristic, which is particularly disadvantageous in the case 

 of a substance such as iron which ha? two critical ranges, of 



TABLE 1 

 Thermoelectric Power of Jrox Agaixst Platixcm 



requiring a length of the material in question to have a tempera- 

 ture distribution extending from the maximum to the. lowest 

 temperature. There may then be ambiguity or superposition of 

 thermoelectric effect- 



U-ing a length of pure iron wire (Fe =99.968 per cent) of some 

 7 cm. length and 0.05 cm. diameter and joined between the hot 



1 To appear in detail as Bureau of Standards Scientific Paper Xo. 296 (Bull. 

 Bur. Stds., vol. 14). 



