633 



Mean Diurnal Disturbance Variation of the Magnetic Declination. 

 Figs. 1 and 2, Kew and Hobarton. Fig. 3, St. Helena. 



Local Astronomical Hours. 

 18 19 20 21 22 23 1 23 4 5 67 8 9 10 11 12 13 14 15 16 17 18 



Fig. L 



Kew. Westerly Deflections. 

 ... ~ ^ Hobarton. Easterly Deflections. 



Hobarton. Westerly Deflections. 



1-0 



O'o 



18 19 20 21 22 23 1 23 45 6 7 89 10 11 12 13 14 15 16 17 18 

 Local Astronomical Hours. 



Local Astronomical Hours. 

 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 1 2 34 56 



2-5 



2-0 



10 



0-5 



Fig. 3. 



St. Helena. Westerly Deflections. 



2-0 



l-o 



1-0 



0-5 



7 8 



10 11 12 13 14 15 16 17 18 19 20 21 22 23 1 23 4 5 

 Local Astronomical Hours. 



