Balance ob Veetical Foece Magnetometee. 



xliii 



Table 6. — Observations of Deflection of tlie Balance Magnet resting upon the 

 Agate Planes, January 6, 1848. 



Table 7- — Observations of Deflection of che Balance Magnet suspended horizontally 

 by the Declinometer Thread, January 10, 1848. 



From the deflections, Table 7, and the formula 

 M 

 we find 



- logj9j - 9-88791 - log 9, = 9-11654 



From the previous equation, 



log ^ = 9-13614 



A. 



tan u — 



M 



'''■'(i+A+% 



