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 Pendulum 33 Pendulum 34 
Vienna, 1892 Christiania, 1897 
05061974 0°5064405 075059202 05061611 
1970 4499 9143 1578 
1967 4399 9159 1613 
Mean 0°5061970 0°5064441 9190 1618 
Mean 075059174 0:5061605 
Christiania, 1892 
Khabarova, 1893 
0:5059150 05061620 
9194 1585 05057519 0°5059884. 
1667 7547 (4) 9760 2 
Mean 0°5059172 0:5061624 1 Mean 05057528 0°5059884- 
Christiania, 1893 January 16, 1894 
0°5059202 0:5061625 0°5056609 
9138 1641 6592 
Mean 0'5059170 05061633 4 Mean 05056601 
1 
O. E. Scutorz, ,Resultate der im Sommer 1893 in dem nordlichsten Theile Nor- 
wegens ausgefiihrten Pendelbeobachtungen“, etc. (Kristiania, J. Dybwad, 1894), p. 7, 
these periods of oscillation are given as, 
In 1892, 0:5059169 and 0°5061591; 
» 1898, 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°.4. 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. 
