578 WEBER ON A TRANSPORTABLE MAGNETOMETER. 



2. Experiments of Deflection. 



Hence the simple deflections Vq, v^ are obtained for the di- 

 stances Rq, Rj (without regard to signs) 



t'o = 2° 45' 4"-5, for Rq = 55675 

 Vy = 5° 5' 7''-5, for Ri = 453-25. 

 Consequently, if tang, v be developed according to the powers 

 of R, 



tang. V = 8305800 R~^ — 4081300000 R~ ^ 



whence (see Intensitas Vis Magneticae, Art. 21, 22), 

 M 



T 



= 4152900. 



With the comparatively great distance of the deflecting bar 

 from the needle (equal to from 5 to 6 times the length of the 

 needle), the determination of the coefficient of the second mem- 

 ber of this equation (which is to be divided by the 5th power of 

 the distance) is uncertain, and it is therefore better to dis- 



M 



regard it. We then obtain for 7^ two values, 



Ro'' tang, t'o = 4146600 

 Ri'^ tang. Vi = 4143200, 

 viz. the mean of which may be taken, consequently, 



Y = 4144900, 



which differs but little from the above value. 



