MAGNETIC SURVKY OF GREAT BRITAIN. 



119 



Report resumed hy Major Sabine. 



To the observations in Ireland I have to add a very careful 

 determination of the dip at Lissadel in the county of Sligo, 

 the seat of Sir Robert Gore Booth, Bart., made at my request 

 with Captain Fitz Roy's Gambey by Archibald Smith, Esq., of 

 Jordan Hill. 



Table XL. 



Collecting in one view the values of u and r obtained from the 

 observations in Ireland, we have as foUoAvs : — 



Table XLI. 



Regarding the values of m and r as entitled to weight, propor- 

 tioned to the number of stations, of which each is the represent- 

 ative, we obtain — 60° 32' and 0'-594 as the mean values derived 

 from the Irish series, and corresponding to the mean geogra- 

 phical position, 53° 21' N. and 8° 00' W. 



