XXVI 



Introduction to the Makerstoun Observations, 1844. 



the omission of the correction 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 : — / being the value of the bifilar read- 

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

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

 being 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 (/- 0-002618) 

 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. 









TO 







Bifilar 

 Reading. 



X Reduced 



Mean 





Date. 



Pairs of Distances. 



Log Y 



Log m X. 



X. 



to Mean 

 Bifilar. 



of 

 Group. 



Weight. 



1843. 



Feet. 



Feet. 









Sc. «liv. 









Aug. 11 



5-0 



and 6-5 



0-465366 



1-517261 



3-3570 



511-5 



3-3526 



1 3-3512 



1 





5-5 



— 6-5 



0-466084 





3-3542 





3 



3498 



Aug. 21 



50 



— 6-5 



0-461487 



1-519634 



3-3812 



511-1 



3 



3770 



' 







5-5 



— 70 



0-460922 





3-3834 





3 



3792 









5-5 



— 7-5 



0-461249 





3-3821 





3 



3779 









6-0 



— 8-0 



0-457371 





3-3973 





3 



3930 



.3-3807 



3 





6-5 



— 8-5 



0-459456 





3-3891 





3 



3849 









7-0 



— 9-0 



0-462511 





3-3772 





3 



3730 









7-0 



— 9-5 



0-460677 





3-3844 





3 



3801 



/ 





Nov. 8 



50 



— 6-0 



0-464232 



1-520430 



3-3736 



510-9 



3 



3695 



] 







50 



— 6-5 



0-463155 





3-3778 





3 



3737 



1 3-3732 



3 





5-25 



— 70 



0-462200 





3-3815 





3 



3774 





5-5 



— 7-5 



0-463487 





3-3765 





3 



3724 



J 





Nov. 14 



5125 



— 6-75 



0-457337 



1-515526 



3-3814 



507-6 



3 



3779 



1 3-3757 



2 





5-25 



— 70 



0-458435 





3-3771 





3 



3736 



Dec. 18 



50 



— 6-625 



0-456307 



1-516321 



3-3885 



515-2 



3 



3858 



1 3-3813 



2 





5-25 



— 70 



0-458598 





3-3796 





3 



3769 



1844. 























Feb. 17 



50 



— 6-75 



0-458660 



1-517407 



3-3836 



524-6 



3 



3851 



3-3851 



1 



Mar. 23 



5-125 



— 6-75 



0-459748 



1-515895 



3-3734 



520-8 



3 



3768 



I 3-3793 



2 





5-5 



— 7-25 



0-458444 





3-3785 





3 



3819 



May 29 



5125 



— 6-75 



0-450795 



1-510367 



3-3868 



535-7 



3 



3831 



I 3-3816 



2 





5-5 



— 7-25 



0-451555 





3-3838 





3 



3801 



Aug. 5 



5-125 



— 6-75 



0-451689 



1-512270 



3-3907 



540-7 



3 



3846 



1 3-3852 



2 





5-25 



— 6-875 



0-451379 





3-3919 





3 



3858 



Dec. 26 



5-083 



— 9-7083 



0-457975 



1-516858 



3-3841 



539-5 



3 



3786 



1 







5-25 



— 9-83 



0-458462 





3-3822 





3 



3767 



V 3-3789 



2 





5-5 



—10-25 



0-457238 





3-3870 





3 



3815 



) 





Dec. 30 



5-083 



— 9-7083 



0-459337 



1-516483 



3-3773 



534-9 



3 



3740 



1 3-3727 



9 





5-25 



— 9-833 



0-459976 





3-3748 





3-3715 





