NO. 4 TEMPERATURE VARIATIONS IN THE NORTH ATLANTIC I95 



division of this period into two. The quarterly division is of course 

 ehminated by the process of smoothing. 



The observational material at Batavia continues from the year 

 1866 to 1910, that is, through four sun spot periods. We have taken 

 the mean value for these four periods and the results are given in 

 figure 70, where the sun spot curve S is obtained by taking the 

 mean of the four eleven-year periods. Corresponding curves of 

 air temperature T, air pressure B, and precipitation P for Batavia 



n 1 Z 5 If 5 6 7 8 9 10 II 1 



Figure 70. Batavia. Average variations in the air temperature, (T) : air 

 pressure, (B) ; rainfall, (P) ; sun spots, (S) ; prominences, (RC), during the 

 sun spot periods in the time 1866 to 1910. 



are given. The prominence curve R C is obtained by similar com- 

 putation for the time interval 1872 to 1910. 



From these two figures it may be seen as we have already found 

 that the air pressure and other phenomena on the whole are earlier 

 with their variations than the air temperature. In figure 70 the 

 division of the eleven-year period into two halves is distinctly shown 

 for all meteorological elements. 



The analysis of meteorological elements in Batavia shows there- 

 fore distinctly variations with 11, 5i and 2f years, therefore the 

 whole, half, and quarter of the sun spot period. 



