At the various stations, the following corrections should therefore be made to 

 the times of swing of the pendulums : 



No. 



o. 



Cape Evans 

 Wellington 

 Melbourne 

 Christchurch 



-4xlO~ 7 sec. 



+2 



+3 

 +2 



No. 7. 

 -4x10-' sec. 



+2 

 +3 

 +2 



No. 21. 

 +8X10~ 7 sec 

 -5 

 6 

 4 



By the addition of these figures we obtain the reduced time of swing of each pen- 

 dulum, and finally the reduced differences in Table LXIII. 



TABLE LXIII. 



In this Table, indications are seen of a change in the differences for No. 7 and 

 No. 21 which took place before the first field observations at Cape Evans, and of a 

 change in No. 5 operating during Cape Evans B and C. The change, however, is not 

 sufficiently definite in character to lead us to neglect the observations of Potsdam I 

 in arriving at the final values. 



A Table (LXIV) showing the differences of the pendulums from one another has 

 also been formed, but this throws little light on the subject beyond confirming the 

 temporary change experienced by No. 5 between the first and second year's observations 

 at Winter Quarters. 



78 



