TABLE XV. 



TABLE XVI. 



Probable error of one difference 



M,,-5 

 jyr n 



Ol M 



*j i. 1.* A ij 



2-7xl(T 7 sec. 



3-2 



1-5 



Mean 



2-5XKT 7 sec. 



By comparison with the corresponding values obtained in the first Potsdam 

 observations, we see that the second series of observations appear to have a slight 

 advantage. Thus, notwithstanding the fact "that, by comparison of the values of e m 

 alone in the two cases, the accuracy of the result is seen to be much greater in the initial 

 observations. 



23 



B 4 



