MAP 1. 



lour. Sc. Coll. Vol. XIV. PI. LXXXVIII. 



Red Figurt 

 Blue Figw 



ISOGONIC LINES (o) FOR 1895,0 



^cd/rom Observations at Hil Stations by the Method oj Least Squares. 



DISTURBANCES OF DECLINATION 



Minutes of Arc. 

 s indkate that the Westerly Decimation is Oreater than the Calculated Value 



3'.146 -0M379(;- 1 387 + 0'.2894((p - 377 



- 0-.0001803<r:i387'-0'.0000657(A- 1387(9=-377-0'.0000209cf=37ï' 



Secular Variation per A7mum 

 »= [l.'08-0'.00027(,l-1387+0'.0048 (y-377-0'. 00000027(Xrî3f)-'](r-1895,Û) 



