1904. No. 2. THE DIURNAL VARIATION OF TERRESTRIAL MAGNETISM. I T 



recommended by von Bezold — January and December, February and 

 November, March and October, April and September, May and August, 



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Fig. I. 

 and June and July. As it will be seen, the diagrams for the two sta- 

 tions correspond very closely both as regards form and area; and it is 

 very clearly shown that the regularity of the diagrams is greatest at the 



