Induction of instantaneous Electric Currents. 509 



But reserving to myself to treat, on another occasion, of the 

 induced currents produced by sparks and by other electric 

 currents, artificial or natural, it appears to me that we may in 

 the mean time conclude, — 



1st. That the instantaneous current of the Leyden jar, or 

 of the Franklinian square* passing through a metallic cur- 

 rent, causes an electric current, also instantaneous, in another 

 metallic conductor, near to it, and forming a closed circuit, — 

 a phenomenon which I call Ley den-electrical induction, be- 

 cause analogous to that called by Faraday volta-electric in- 

 duction. 



2nd. That the same induced current may cause in another 

 conductor a second current of induction ; and this second, 

 again another, and so on ; whence may be produced currents 

 of Leyden-electrical induction, of the second and third orders, 

 &c. 



3rd. That the Leyden-electrical induction also takes place 

 when the circuit through the metallic actuated conductor is 

 closed by a very long metallic conductor, or even by a con- 

 ductor not wholly metallic. 



4th. That such induction also takes place when the dis- 

 charge of the Leyden jar traverses a very long metallic con- 

 ductor, and also a non-metallic conductor ; nor does the 

 phenomenon fail to appear, when it is not the identical fluid 

 of one coating which passes to the other. 



5th. That the induced current takes in the actuated con- 

 ductor the same direction which the inducing current takes 

 in the actuating conductor whenever the jar has great electric 

 capacity, and is not too weakly charged. But the direction 

 is opposite when the charge of the jar is rather weak, or when 

 the electricity has to pass through a bad conductor, or when 

 the jar is of small electric capacity. 



6th. That the phenomena of induction may be seen, 

 although neither the actuating nor the actuated conductor is 

 metallic. 



7th. That finally, such inductions are not exclusively from 

 Leyden jars and the Franklinian square, but are obtained 

 also with instantaneous electric currents from other sources. 



[* Quadro Frankliniano ; meaning, we presume, the pane of glass with 

 tin-foil coating on both sides ; but this, we believe, was the device, not of 

 Franklin, but of Smeaton. — Edit.] 



