XXVI 



Intkoduction to the MAiiEKSTOUN Obsebvations, 1844. 



the omission of the correctioii for the induction coefficient, the observations for 1843 

 have been recomputed by the formulae given in the preceding pages ; the results will 

 be found in the following Table. The value of X from each pair of deflections is re- 

 duced to the mean bifilar reading for the year. The bifilar was adjusted in the year 

 1843, and the reduction of the bifilar scale readings for 1843 (column 6, Table 3) 

 to the mean for the year was made as follows : — fhe'mg the value of the bifilar read- 

 ing (column 6) obtained by the formulae after Table VIII., p. 230, 1843 ; 0-002618 

 being the mean for 1843 obtained from line 7, p. 231, 1843; and 1-316 (see No. 40) 

 lieing the factor for reducing the quantities, Table VIII., p. 229, 230, 1843, to their 

 true values ; the reduction of X (column 5, Table 3) to the mean for 1843 



= 1 + 1-316 (/- 0002618) 

 The reduction of X for 1844 is made by the factor 



1 + 0-000135 (6 - 527-9) 



b being the bifilar reading column 6 for 1844, and 527-9 being the mean bifilar 

 reading for 1844. 



Table 3. — Results of the Observations for the Absolute Horizontal Intensity, 



in 1843 and 1844. 



