OF THE TOTAL FORCE. 



29 



(G). Solar-Diurnal Variation of the Magnetic Total Force October to March, 1841 — 18i5. 



(Expressed in parts of tlie force.) 



"o 



a 





'1 1 r 1 1 



1 1 1 1 1 



1 1 1 1 1 



1 I 1 1 1 



- 



+.000200 



100 







100 



—.000200 



- 



/ 



^ 



^\ 



.^y 



- 



- 





,/ 



N 



"^■^^' 



- 



+.000300 

 200 

 100 



- 





y 



\ 



\ 





- 



100 



200 



—.000300 



- 







-\; 



./ 



- 



+.000300 

 200 

 100 



- 



^'' 









• - 



100 



200 



—.000300 



- 



1 1 1 ' 1 



1 1 1 1 1 



\ 



1 1 1 ! 1 



1 1 1 1 1 



- 



+.000300 

 200 

 100 

 October 



100 

 200 



—.000300 



+.000200 



100 



December 



100 



200 



—.000300 



January 



+.000400 

 300 

 200 

 100 

 

 100 

 200 

 300 

 000400 

 / 



February 



8 10 g 14 16 18 20 22 24i' 



Philadelphia mean time. 



