2'58 



MAGNETIC OBSERVATIONS ON THE BOUNDARY LINE 



units = 13.86 at the time that it is found 1,836 in the arbitrary scale. Applying the same 

 ratio to our mean total intensity, 11.65, we find 1.543, and we have the following comparison : 



Latitude. 



O I 



31 27 



32 43 



Longitude. 



108 45 

 108 30 



Total intensity 



1.543 



1.580 



the latter from three stations 



expected from the circuitous comparison involved. 



in 1851 ; exhibiting a closer correspondence than might be 



'4 





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