MAGNETIC SURVEY OF GREAT BRITAIN. 



73 



Table XIV. contains the latitudes and longitudes of Mr. Phil- 

 lips's stations, and the mean dip at each station reduced to the 

 middle period of his observations, viz. the 1st of August, 1837- 



the 22nd July, one of its arms having been originally longer than the other, so as 

 sometimes to touch the circle. By shortening this arm the centre of gravity was 

 slightly displaced, as is shown by the observation of Aug. ] . This was remedied 

 by Mr. Phillips, the same evening, by grinding the other arm. 



