184 WEBER ON THE CONNEXION OF DIAMAGNETISM 



Without current, bismuth in the middle . 492*0 



„ bismuth above . . . 497*2 



„ bismuth below . . . 490*2 



„ bismuth above . . . 498' 2 



„ bismuth in the middle . 490*0 



We here observe that without a current the action is opposed to 

 that exhibited when a current is present ; the diiFerence between 

 top and bottom being 



— 7*5 divisions of the scale. 



Observations of Prof. Hankel : — 



Position of magnet without current 496*5. 



With current, bismuth above .... 492*1 



„ bismuth below .... 500*7 



„ bismuth above . . . . 491*6 



„ bismuth in the middle . . 497*7 



The difference between top and bottom amounts therefore to 



+ 8*9. 



Without current, bismuth in the middle . 497*5 



„ bismuth above . . . 503*5 



„ bismuth below . . . 498*0 



„ bismuth above . . . 502*6 



„ bismuth in the middle . 494*8 



The difference between top and bottom amounts here to 



-5*0. 



The bismuth bar was then reversed and the same action w&s 

 exhibited, namely, — 



Position of magnet without current 500*0. 

 With current, bismuth above . . . . 4 97 "3 

 „ bismuth below . . . . 507*1 



„ bismuth above .... 498*0 



The difference between top and bottom being 



+ 9-4. 



When, instead of determining the position of rest, the elongations 



