48 



DISCUSSION OF THE VERTICAL COMPONENT 



(C). Solar-Diurnal VARLiTioN of the Vertical Force, April to September, 1841 to 1845. 



(Expressed in scale divisions.) 

 l'i = 0.000033 parts of the force. 



1 

 3 



5 

 7 

 9 

 1 

 3 

 5 

 7 



689 

 1 

 3 

 5 

 7 

 9 

 1 

 3 



705 



691 



3 



5 



679 7 



1 9 



3 701 



5 3 



August. 



September. 



10 I 14 16 18 20 22 24" 

 o 



Philadelphia mean time. 



