141 



TABLE V 



SAMPLE TITRATIONS INDICATING PRECISION OF OPERATOR 



Sample Number 



Duplicate Titrations 



1014, 3/28/56 



1104, 3/28/56 



1252, 3/28/56 



1316, 3/28/56 



1342, 3/28/56 



18.61 

 18.60 

 18.61 



18.60 

 18.60 

 18.61 



18.60 

 18.59 

 18.60 



18.62 

 18.62 

 18.62 



18.61 

 18.61 

 18.61 



Average CI' 



18.61 



18.60 



18.60 



18.62 



18.61 



