t 



xxvii 



Unifilar Magnetometer. 

 The following Table contains the results of the equations for the different values 



of r. 



m 



Aug. 21, =^=288977 ; p= -01325 ; y= -1-0574. 



m 



Nov. 8, - = 2-90250 ; p= -0-1013 ; q= -2-8539. 

 A. 



Table 7. — Results of the Equations of Condition. 



r. 



August 21. 



November 8. 



Results. 



Results. 



Feet. 







500 



+ 0-000002 



-0-000051 



5-25 





+ 0-000359 



5-50 



+ 0000163 



-0-000275 



600 



-0-0007S6 



-0-000495 



6-50 



-0-000610 



+ 0-000144 



700 



-0-000091 



+ 0-001098 



7-50 



-0000556 



-0-000788 



800 



+ 0-002780 





8-50 



+ 0-000631 





9-00 



-0-001908 





9-50 



-0-000333 





30. The mean of the above values of p and q were applied to the equations for 

 August 12, November 14, and December 18 ;* on the first of these days deflections 

 were made at three distances, and on the other two at four distances. The results of 

 the equations are as follow : 



Table 8, — Results of the Equations for August 12, November 14, and 



December 18. 



Au 



igust 12. 



November 14. 



December 18. 



r. 



m 



IT 



r. 



m 



"x" 



r. 



x" 



Feet. 



5-000 



2-8878 



Feet. 



5-125 



2-8701 



Feet. 



5-000 



2-8890 



5-500 



2-8906 



5-250 



2-8662 



5-250 



2-8738 



6-500 



2-9005 



6-750 



2-8677 



6-625 



2-8676 







7-000 



2-8688 



7-000 



2-8745 



Mean 



2-8928 



Mean 



2-8682 



Mean 



2-8762 



* This method was recommended by Mr Atry (Proceedings of the Committee of Physics of the 

 Royal Society, No. 1.) The results for Nov. 14 and Dec. 18, by the approximate formula (31.), shew to 

 some extent how far it may be depended on. It should be remembered that the magnet was subjected 

 to temperature experiments between Nov. 8th and 14th. 



