Nitrogen Thermometer from Zinc to Palladium. 159 

 Summarized Analyses of Metals* 



Impurities 









Metals 









stated, in 













fractions 

 of \% 



Palla- 

 dium 



Cobalt 



Nickel 



Copper 



Silver 



Alum- 

 inum 



Antimony 



Zinc 



Pt 



Ir 

 Eh 



0-007 



•008 



none 



none 



•0023 



•OOllf 



•0001 























Ku 



a 

















An 



" 



none 



* none 



none 



•0005 









Se 









it 











Te 









a 











As 





none 



none 



a 



none 



none 



none 



none 



Sb 





a 



ci 



a 



" 



a 





•002 



Sn 





" 



" 



n 



» 





•02 (?) 





Hg 











" 





none 





Ag 





none 



none 



•0006 







" 



none 



Pb 



none 



•0176 -0001 



none 



•0008 







•051 



Bi 



" j none 



none 



" 



none 





none 



none 



On 



trace "0178 



•0523 





trace 



•003 



•004 



none 



Cd 



none 



none 



none 



none 



none 





none 



•004 



Ni 



a 



" 





a 



a 



none 



" 



none 



Co 



a 





•1063 



" 



a 



<< 



it 



" 



Fe 



•010 



•0006 



•0042 



•0038 



•0011 



•043 



•007 



•006 



Zn 



trace ? none ? 



none ? 



•0007 



none 





none 





Mn 



1 none 



none 









i i 





Si 







none 





•190 





none 



C 









•0003 



•013 







S 





•013 



none 



■0020 



•0004 



•002 





none 



P 













none 







Ca 













a 







Na 













n 







K 













a 







Total 



•025 -049 



•165 



■008 



•003 



•251 



•031 



•063 



* A blank opposite any impurity means that it was not looked for. 

 f Means platinum metals. 



7. Conclusion. 



It is now something over five years since the Geophysical 

 Laboratory took up the task of redetermining the absolute 

 temperature scale from 300° to 1100° with the nitrogen ther- 

 mometer, and of extending it, if it should prove practicable to do 

 so, to 1600° C, for it is in this upper region that most of the 

 mineral relations which it is the chief purpose of the labora- 

 tory to study are found. Two preliminary publications have 

 been made during the investigation. One, a brief summary 

 of preliminary work up to 1100°, was given before the National 

 Academy o 4 :' Sciences and the American Physical Society in 

 April, 1907,* the second covered the same ground at con- 

 * Abstract, Phys. Rev. xxiv, 531, 1907. 



