NO. 8.] 



PENDULUM OBSERVATIONS. 



55 



The observations taken thus give the following mean value for the 

 periods of the pendulums: 



If we take the difference between the periods of the two pendulums, we 

 obtain : 



From the observations in Vienna, 1892, S 34 S 33 = 2441 X 10 ~ 7 



Christiania, 1892, = 2452 



- 1893, = 2463 



- - 1897, = 2431 , 



or as a mean = 2447 



The following are the results of the observations made during the 

 expedition : 



The observations of June 10, 1895, S 3 4 S 33 = 2484 X 10 ~ 7 

 -- 11, 1895, = 2415 

 -- April 29, 1896, = 2439 



30, 1896, = 2482 , 



these values agreeing satisfactorily with the above-determined mean values. 

 If the two observations made with separate pendulums on the 14th 

 and 23rd November, are reduced to the same latitude, they will give a diffe- 

 rence of 2513 X 10 ~ 7 , a value which is not too far removed from the above 

 mean. 



