Induction of instantaneous Electric Currents- 503 



side, a second uncovered band ; this remained on one side free 

 for one decimeter ; and on the other for nine, the two ends being 

 connected together. Seven decimeters of this second band 

 (in the space not attached to the first) were covered with silk, 

 and to all this part, except two decimeters, was attached a 

 third uncovered band, having also a space of one decimeter 

 free on one side, and nine decimeters free on the other. 

 Things being thus disposed, the ends of the first band were 

 connected with those of the coil of the re-electrometer, and 

 the ends of the third band were destined to be connected with 

 the two coatings of the Leyden jar. 



The trial being made, the deviations of the needle of the re- 

 electrometer never failed. The usual small Leyden jar being 

 charged as highly as possible, that is to about 80 degrees of 

 the quadrant electrometer, there was a deviation of almost 

 seven degrees. When charged to twenty degrees, there was 

 a deviation of one degree and a half; and also with weak 

 charges, and on many occasions with mere residual charges, 

 I obtained visible deviations. Then the instantaneous current 

 which passed into the third band of lead caused an induced 

 current in the second, which formed as it were a large closed 

 ring, and this current in its turn caused a second Leyden- 

 electrical induction in the first band, which formed as it were 

 a second large ring or closed circuit, being joined, as I have 

 stated, to the re-electrometric coil. 



I closed also the circuit formed by this third band, by con- 

 necting the ends of it, and covered a free space of seven de- 

 cimeters with silk, and attached to it a fourth uncovered band 

 in the manner now described ; the Leyden jar being dis- 

 charged upon this, there were unequivocal signs of an in- 

 duction which we will call of the third order, and I thus ob- 

 tained also the induced currents of the fourth and fifth orders, 

 by adding another ring similar to those described, and then 

 another still. 



XIV. After the result here stated, there appeared to me 

 no longer any doubt that the instantaneous currents of the 

 confining armatures cause currents by true induction or ac- 

 tuation in the conductors near which they pass; and I ad- 

 dressed myself to study the properties of this action. I wished 

 first to see whether the induction would take place even if 

 there should be some metallic stratum as well as the confining 

 strata between the actuating and actuated conductors. 



Between two bands of lead, both covered with silk, I placed 

 another, with care, in order that there might be no metallic 

 contact between the bands. Having connected one of the 

 covered bands with the wire of the re-electrometer, and di6- 



