On the Production of Transient Electric Currents. 127 



Longitudinal 

 magnetising 



force, 

 c.g.s. units. 



Transient currents given on reversal of 

 magnetising current. 



A to B 



B to A 



TVTpfm 



1 -9^ 



— 2 



+ 2 



2 



1 -f\4. 

 X Lr± 



— 3 



+ 3 



3 





_ 7 



+ 7 



7 



^ -90 



— 15 



+ 15 



15 



O O^D 



— 21 



+ 21 



21 



4 *2 



— 33 



+ 32 



32 - 5 



5 *0 



-46 



+ 45 



45-5 



6 *1 



-59 



+ 57 



58 



8 "0 



-71 



+ 70 



70-5 



11 '3 



-82 



+ 80 



81 



14 -0 



-86 



+ 84 



85 



15-8 



-86 



+ 85 



85^ 



17 1 



-86 



+ 84 



85 



19-7 



-84 



+ 83 



83 -5 



23-7 



-75 



+ 75 



75 



A continuation of the same experiment showed that when the 

 magnetising force was increased the transient currents continued to 

 diminish, falling almost to zero, but did not become reversed. Even 

 with a wire of very soft iron a magnetising force of over 100 c.g.s. 

 units still gave effects of the same sign as the above. 



§ 19. Similar series of experiments were made with a piece of 

 pianoforte-steel wire in its ordinary temper. Fig. 3 shows how the 



Fio. 3. 



