Induction of instantaneous Electric Currents. 501 



trials, either the suspected dispersion does not take place, or 

 if it does, the movements of the magnetized needle do not 

 proceed from it. 



VII. Instead of placing the plate, which we will call the 

 actuating plate, parallel to, and above the other which closes 

 the re-electrometric circuit, and which we will call the actuated 

 one, I placed it parallel to it laterally, and at the horizontal 

 distance of two centimeters. The currents produced by Ley- 

 den-electrical induction were somewhat weaker ; but neverthe- 

 less sufficiently great to be seen, and measured. 



VIII. Having replaced the actuating plate* above the 

 other, and turned it somewhat in the horizontal plane round 

 its central point, so that it might form an angle with the under 

 one, the induced current was weaker, and still more so when 

 the angle was greater. If the angle was of 60 degrees, the de- 

 viation caused in the instrument by the induced current was 

 scarcely perceptible. And these experiments also prove, that 

 the deviations do not proceed from a current transferred by 

 dispersion, but rather from true Leyden-electrical induction. 



IX. Having joined the ends of the re-electrometric coil by 

 means of a fine copper wire, silvered, and then covered as 

 usual with the little pieces of wool, and with the sealing-wax 

 upon which was the usual plate of lead or copper, or zinc, 

 upon which the jar was discharged, the induction took place 

 as usual. It took place equally when the ends of the coil were 

 connected with one of the said plates, and the jar was dis- 

 charged upon the metallic wire duly placed upon the cake of 

 sealing-wax. 



X. I placed upon the said cake two insulating supports of 

 glass, covered with sealing-wax, five centimeters high, and 

 upon them the usual metallic plate, duly placed under one 

 part of the re-electrometric wire. I then discharged the Ley- 

 den jar from one end to the other of the plate itself, and I had 

 the deviation by actuation which at that distance I usually 

 obtained. 



Having inclosed in many folds of silk ribbin all but the 

 extremities of the actuating plate upon which I wished to dis- 

 charge the jar, and which I held in my hand parallel to the 

 actuated plate, and carried to the height of six, ten, and even 

 fifteen centimeters, the signs of electric induction never failed. 



XI. The position and direction of the jar when discharging 



* For the sake of brevity, I call a band or plate actuating through which 

 the electricity passes, or ought to pass, its extremities being connected 

 with the coatings of a Leyden jar or of a Franklinian square [see note, p. 

 509.]; and I call a plate actuated, in which (being near the former) arises, 

 or may arise, an induced electric induction. 



