A. M. Mayer on the Magnetic Declination 



! determinations are here expressed graphically. The ^ 



ordinates above the 



line indicate a W., and 



those below, an E. post- 



1 of the N. end of 



, i magnet referred to 



I the line of mean decli- 

 nation of Oct. 14 Tlie 

 vertical line C show 

 J the average daily range 

 I (12'-85)asgivenbyttie 

 I mean of the range o 

 1 the five days before and 

 I of the five days alter 

 1 the auroral display; b^^' 

 i including in tie rne^ 

 I the range of Oct i* 

 j The line D repre^f' " 

 I the range (18''4'-' 

 I Oct. 14. A is the ; 

 I tion the magnet 

 (+9'-33)atPlj' 

 n Oct. 14, whilo_ 

 ^^^— — the declination!- 

 e of greatest E, elongation) on the morning of 0' 



