The results of the pendulum observations are given in Tables XLIII and XLIV. 



TABLE XLIV. 



From these, we find the probable error of a single value to be : 



e & -- -- 4-8 XlO- 7 sec. 

 e- t -- -- 3-7 

 e n =12-4 

 e m =-- 5-4 



The probable errors of the mean result become : 



p & -- -- 2-4 XlO' 7 sec. 



Pl - : 1-8 



<p A = -- 6-2 

 p m =-- 2-7 



As in previous cases, Table XLV is formed in order to examine the observational 

 accuracy independent of errors due to variations in clock rate from one set of 

 observations to another. 



59 



