[jackson] 



STUDY OF MAGNETIC DECLINATION 



105 



Table IV. 



Diurnal Variation of Magnetic Declination at Meanook for each Month during the 



Year 1917. 



Table V. 



Value of constants in the Fourier Series F = ai sin {a\ + t) +82 sin («2 + 2t) + • • 

 for Agincourt and Meanook Seasonal Diurnal Curves. Percentage 

 Values of the Amplitudes and Local Mean Time of Occurrence 

 of 1st Maximum. 



Percentage Value of Amplitudes a. 



Summer 

 Equinox 

 Winter. . 



Summer 

 Equinox 

 Winter. . 



% 

 41-3 

 43-7 

 39-3 



% 

 55-9 

 60-2 



4-2 



«1 



29-2 

 38-9 

 48-9 



351-2 



4-6 



17-2 



41-3 

 34-5 

 41-1 



33-9 

 24-0 

 31-2 



«2 



211-8 

 207-9 

 203-7 



15-4 



16-1 



8-9 



7-9 

 8-0 

 6-3 



79-6 



17-2 



331-6 



2-0 



5-7 



10-7 



2-3 

 8-0 

 8-3 



ai 



360-4 241-0 

 251-4 266-9 



227-1 1236-4 



Local Mean Time of Occurrence of First Maximum. 



Summer 

 Equinox 

 Winter. . 



h 



3 29 

 3 03 

 3 34 



Sec. m, Sig. 8 



