OF THE TOTAL FORCE. 



27 



The following comparison of the observed and computed values for September 

 shows about average differences ; in general the summer values are better repre- 

 sented or less irregidar than the winter values. 



Comparison for September. 



Time. 



Observed. 



Computed. 



0— c. 



Oi> 21.1"" 



2 " 



4 " 



6 " 



8 " 

 10 " 

 12 " 

 14 " 

 16 " 

 18 " 

 20 " 

 22 " 



—.000408 

 —.000263 

 —.000218 

 —.000142 

 +.000054 

 +.000226 

 +.000436 

 +.000488 

 +.000343 

 +.000022 

 —.000240 

 —.000299 



—.000355 

 —.000298 

 —.000217 

 —.000127 

 +.000029 

 +.000236 

 +.000439 

 +.000492 

 +.000825 

 +.000033 

 —.000223 

 —.000344 



—.000053 

 +.000035 

 —.000001 

 —.000015 

 +.000025 

 —.000010 

 —.000003 

 —.000004 

 +.000018 

 —.000011 

 —.000017 

 +.000045 



