102 



EIGHTH REPORT. — 1838. 



in the Scotch Magnetic Report, and are reprinted here, so 

 as to have all the data connected with Ireland present in one 

 view. The needles employed, (Mayer's needle and needles 

 S. 1, S. 2,) have been already described. 



Table XXXI. 

 Major Sabine's Observations. 



My own additional observations were confined to Dublin, and 

 were made in the years 1836 and 1838. The observations of 

 the former year, contained in Table XXXIII, were made with 

 the statical needles, L. 3 and L. 4, already described. Those 

 of the latter, (Table XXXII), with the dip circle, and needle 

 G. 2 made by Gambey * ; and with another circle of the same 

 size, and two needles, made by the same distinguished artist 

 for the Dublin Observatory. All these latter observations 

 were made according to the method of arbitrary/ assimuths. In 

 conjunction with the observations of Captain Ross in Dublin, 

 they are taken as the basis on which the determination of the 

 corrections of my other needles, L. 1, L. 3 and L. 4, is made 

 to rest. 



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