OF THE MAGNETIC DECLINATION. 



TyPB-CuEVBS OP THE REGULAB SoLAB-DlUHHAL VARIATION OP THE DECLINATION. 



19 



Summer 



Year 



Winter 



tiit 



i i i i i i i i 



6' 

 5 

 4 

 3 

 2 

 1 

 



1 

 2 

 3 

 4 

 5' 



3' 

 2 

 1 

 



1 

 2 

 3' 



4' 

 3 



2 



1 







-1 



-2 



-3 



2 4 6 8 10 Noon 14 16 18 20 22 24h. 

 Philadelphia mean time. 



