ILLUSTRATIONS OF THE ANNUAL VARIATION OF THE MAGNETIC DECLINATION. 



Black line. Mean Semiannual Diurnal Variation, March 22 to September 20. 

 Dotted line. Mean Semiannual Diurnal Variation, September 22 to March 20. 



Pig. 1. St. Helena. 



~h E h h h 5 h E h h h h ~h h h h h h h h h h h~ 

 , 12 13 14 15 16 17 18 19 20 21 22 23 01 2 3 4 5 ^ 8 Q 10 1 



Pig. 2 Toronto. 



Fig. 3. Hobarton. 



|12 13 14 15 16 17 18 19 20 21 22 23 01 2 3 4 6 6 789 j ! 



