TABLE LXXTT. 



For the calculation of the value of gravity at the field stations the formula 



\2 





is used, where g, and (j p are the values of "g" at the station and at Potsdam, respectively, 

 and S s and S p are the corresponding periods of swing. 



The value of g,, is taken as 981-292 cms. per sec. per sec. for pillar 32 in the 



Addendum to Page 91. 



1 he assumed value of g p = 981 '292 is that given by Hecker (Verdffentlichung d 

 Konigl. Preusz. tjeodat. Instil., Xene Folge, No. 10). The value generally adopted, 

 the result of careful observations made at Potsdam with the reversible pendulum, is 

 81-274 -OOSfKuhnenandFurtwangler, Veroffent. d. Konigl. Preusz. Geodiit. InstiL, 

 Neue /'ulgc, Xo. 27). The latter figure is that upon which are based the values of g 

 I'-md by Bernacchi at Christchurch, Melbourne, and at the "Discovery" Winter 

 (Quarters, taking the value at Kew, the base station for the "Discovery" Expedition 

 as 9S1 -2(1(1. 



The differences between our values and those of Bernacchi at these stations are 

 partly accounted for by this fact. 



The probable errors of the final result are : 



For Cape Evans 

 Wellington 

 Melbourne 



0-002,'} cms. per sec. per sec. 



0-0014 



+ 0-0012 



91 



