148 



Dr. F. Auerbach on tlie Passage of 









Duration of the after- 



t 





w. 



action. 



At closing. 



At opening. 







0-7906 









s 



0-7911 



? 







6 



0-7904 



— 



No afteraction. 





s 



0-7912 



1 





20" 





0-7907 



\ 40" 





20 





0-7905 



1 







6 



0-7903 





| 20" 



20 





0-7905 



— 





s 



07911 



] 





15 





0-7909 



\ 30" 





15 





0-7908 



J 





30 





7908 









6 



0-7905 



— . 



35" 



35 



s 



0-7906 

 0-7911 



— 



35" 



30 





0-7906 



1 





20 





0-7905 



I 50" 





20 





0-7905 



J 





20 



6 



07903 

 0-7905 





1 30" 





s 



0-7912 



i 





40 





7905 



\ 50" 





10 





0-7904 



J 





20 





0-7904 













0-7904 



— 



No afteraction. 







Mean ... 



45" 



15" 



(2) Without magnetizing. H = 2D. A thick soft-steel 

 wire, F 6 . The bridge in which was placed the galvanometer, 

 the current being closed, and the current, the bridge being 

 closed, were alternately closed and opened. In the first case 

 there cannot in general be any extra current. (The weaken- 

 ing of the current in the wire by branching off into the galva- 

 nometer cannot, in my arrangement, have had any perceptible 

 influence.) In the second case, on the contrary, the full 

 current enters into the phenomenon. It was not powerful ; 

 nevertheless the afteraction was great. This was shown in the 

 following way: — In the first case occurred a first excursion 

 s 1 and a definitive deviation u-^ ; the two stood to one another 

 in a constant ratio, conditioned only by the nature of the 

 galvanometer-needle and the damping. In the second case 

 an excursion s 2 occurred, greater than s 1 , and, just as the 

 needle had finished its periodic oscillations, a deviation u 2 , 

 likewise greater than u ly which sank only gradually to %. In 

 the Table, each row contains two experiments, viz. one of 

 each sort. 



w + w k was =0-2389. 



