44.4- 



Dr. Kaemt/ on the Augmentation of 



But the magnetic 

 power of the connect- 

 ing wire may likewise 

 be of such amount 

 only, that the needle 

 remains stationary be- 

 tween it and the mag- 

 netic meridian, and 

 therefore in ns. In 

 this case we find, in 

 a similar manner, 



E= sin. c.tang. (J— c)M. 

 (C) 



/3) The connecting 

 wire intersects the mag- 

 netic meridian in such 

 a manner that its north 

 pole is opposite the 

 north pole of the needle, 

 in the direction KZ; 

 thei'efore, where there is 

 in KZ, on the right a ^^ 

 north, and on the left 

 a south pole. In this 

 case the needle is im- 

 pelled towards n s. 

 Here we find in the 

 same manner as above, 



E= sin. c. tang, (c+d) M. 



(I>) 



3) The equations hitherto developed however are not quite 

 exact, as it was taken for granted, that the conneting wire and 

 the needle were lying in o?ie plane. If, however, the needle 

 be very long, and the distance of the wire from it very trifling, 

 they may always be applied, particularly on this account, 

 that the error which is committed by neglecting this di- 

 stance, is generally committed in the comparison of electro- 

 magnetic powers, and is therefore less sti'iking. The more 

 exact equations however, which certainly are not so simple as 



the 



