156 



Ml;. K. II. CKIFFITHS AND Ml;. KXKK GRIFFITHS ON THE 



T\\" < >rrections are necessary to make the values off- -) comparable 



\n 3 St / 



(1) The change in resistance by change of" current ; 



(2) The departure of the mean E.M.F. of the group of standard cells used from 



the standards. 



1 $0 

 The correction to for these is designated by Cd cell and R, the experimental 



/. . / 



results are now arranged in order of n. 



Before proceeding with the next step the determination of the mean point of 

 intersection either graphically or by calculation we require the value of the " rise 

 above " in each experiment. 



As an example of the method, we quote that of Experiment IV., June 2, 1912. 

 Number standard cells, 7. 



Contact maker of bridge set up 0'088 Pt beyond switching-off point. 



TABLE VIII. 



