NO. 8.] 



PENDULUM OBSERVATIONS. 



53 



According to the above, the following periods of oscillation for the 'pen- 

 dulums have been found for the various places: 



Pendulum 33 Pendulum 34 



Vienna, 1892 



Pendulum 33 Pendulum 34 

 Christiania, 1897 



Christiania, 1892 



0-5059202 

 9143 

 9159 

 9190 



0-5061611 

 1578 

 1613 

 1618 



Mean 0'5059174 



0-5061605 



Khabarova, 1893 



0-5057519 

 7547 (j) 



0-5059884 

 9760 2 



Mean 0'5057528 



0-5059884 



Christiania, 1893 



January 16, 1894 



0-5059202 

 9138 



0-5061625 

 1641 



Mean 0'5059170 



0-5061633 ' 



0-5056609 



6592 



Mean 0-5056601 



O. E. SCHIOTZ, nResultate der im Sommer 1893 in dem nordlichsten Theile Nor- 

 wegens awgefuhrten Pendelbeobachtungen" , etc. (Kristiania, J. Dybwad, 1894), p. 7, 

 these periods of oscillation are given as, 



In 1892, 0-5059169 and 0-5061591; 

 1893, 9164 . 1618. 



The difference chiefly arises from my having chanced, in the previous calcula- 

 tion, to use a slightly incorrect reduction-formula for the thermometer 20 that 

 was used, and from not having taken into consideration the fact that from 1892 to 

 1893, the zero had risen 0.l. With regard to pendulum 34, moreover, an error had 

 found its way, in 1892, into the time determination, which had previously been 

 overlooked. 



During the experiments with pendulum 34, the temperature of the air rose with 

 remarkable rapidity. The correction for the temperature is therefore presumably 

 too great, as the pendulum has not kept pace with the rise in the temperature. 

 Both the values found for the period of oscillation appear small in proportion to 

 that of pendulum 33, especially as regards the second value, which I have therefore 

 thought it best to leave out of consideration. 



